Socket Flat Head Screw, Head Type Flat, System of Measurement Metric, Drive Type Socket, Drive Size 12 mm, Material Steel, Material Grade/Class Class 10.9, Finish Black Oxide, Thread Size M20-2.5, Minimum Thread Length 80 mm, Fastener Length 80 mm, Head Height 10.16 mm, Head Diameter 40.32 mm, Pack Size Small Pack, Thread Style Fully Threaded, Special Features Not Applicable, Countersink Angle 90 Degrees , Dimensional Standards ISO 10642, Flange Diameter Not Applicable