Socket Head Cap Screw Head Type Standard System of Measurement Metric Drive Type Socket Drive Size 2.5 mm Material Steel Finish Blue Phosphate Thread Size M3-0.5 Minimum Thread Length 20 mm Fastener Length 20 mm Head Height 3 mm Head Diameter 5.5 mm Pack Size Small Pack Thread Style Fully Threaded Special Features Not Applicable Countersink Angle Not Applicable Dimensional Standards ASME B18.3 Flange Diameter Not Applicable Flange Thickness Not Applicable