Socket Flat Head Screw, Head Type Flat, System of Measurement Metric, Drive Type Socket, Drive Size 2.5 mm, Material Steel, Material Grade/Class Class 10.9, Finish Black Oxide, Thread Size M4-0.7, Minimum Thread Length 25 mm, Fastener Length 50 mm, Head Height 2.48 mm, Head Diameter 8.96 mm, Pack Size Small Pack, Thread Style Partially Threaded, Special Features Not Applicable, Countersink Angle 90 Degrees , Dimensional Standards DIN 7991, Flange Diameter Not Applicable