Hex Head Cap Screw System of Measurement Inch Basic Material Steel Material Grade 316 Fastener Finish Plain Dia./Thread Size 1/4 In.-20 Fastener Length 1/2 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) Fastener Thread Style Fully Threaded Fastener Industry Standards ASME B18.2.1 Head Type Standard Min Thread Length 1/2 in Head Height 5/32 in Head Width 7/16 in