'Hex Head Cap Screw, System of Measurement Inch, Head Type Hex, Dia./Thread Size 5/16 In.-18, Thread Type UNC (Coarse), Fastener Length 1-3/4 In., Min. Thread Length 7/8 In., Basic Material Steel, Screw Grade/Class Grade 5, Fastener Finish Zinc Plated, Thread Style Partially Threaded, Thread Direction Right Hand, Head Height 13/64 In., Head Width 1/2 In., Temp. Range -58 Degrees to 302 Degrees F, Proof Load 74,000 to 85,000 psi, Screw Industry Standards ASME B18.2.1, Package Quantity 50'