'Hex Head Cap Screw, System of Measurement Inch, Head Type Hex, Dia./Thread Size 1 In.-8, Thread Type UNC (Coarse), Fastener Length 4 In., Min. Thread Length 2-1/4 In., Basic Material Steel, Screw Grade/Class Grade 8, Fastener Finish Zinc Yellow, Thread Style Partially Threaded, Thread Direction Right Hand, Head Height 39/64 In., Head Width 1-1/2 In., Proof Load 120,000 psi, Screw Industry Standards ASME B18.2.1, Package Quantity 5'