Socket Head Cap Screw, Head Type Flanged Standard, System of Measurement Inch, Drive Type Socket, Drive Size 1/4 in, Material Stainless Steel, Material Grade/Class 630, Finish Plain, Thread Size 5/16 In.-18, Minimum Thread Length 1/2 in, Fastener Length 1 3/8 in, Head Height 0.375 in, Head Diameter 0.468 in, Pack Size Small Pack, Thread Style Partially Threaded, Special Features Not Applicable, Countersink Angle Not Applicable, Dimensional Standards AMPG 2013 ZPS.01, Flange Diameter 11/16 in