Hex Head Cap Screw System of Measurement Inch Basic Material Steel Material Grade Grade 5 Fastener Finish Zinc Plated Dia./Thread Size 1/4 In.-28 Fastener Length 5/8 in Fastener Thread Direction Right Hand Fastener Thread Type UNF (Fine) Fastener Thread Style Fully Threaded Fastener Industry Standards ASME B18.2.1 Head Type Hex Min Thread Length 5/8 in Head Height 5/32 in Head Width 7/16 in Package Quantity 100