Hex Head Cap Screw, System of Measurement Metric, Basic Material Steel, Material Grade Class 8.8, Fastener Finish Plain, Dia./Thread Size M20-2.50, Fastener Length 320 mm, Fastener Thread Direction Right Hand, Fastener Thread Type Metric Coarse, Fastener Thread Style Partially Threaded, Fastener Industry Standards DIN 931, Head Type Hex, Min. Thread Length 52 mm, Head Height 12.5 mm, Head Width 30 mm