Socket Head Cap Screw, Head Type Button, System of Measurement Inch, Drive Type Socket, Drive Size 3/16 in, Material Steel, Finish Black Oxide, Thread Size 5/16 In.-18, Minimum Thread Length 1/2 in, Fastener Length 1/2 in, Head Height 0.166 in, Head Diameter 0.547 in, 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