Dimensions: Thread size: M4. Length L: 40 mm. Total length of screw L1: 42.4 mm. Head diameter D: 7 mm. For flat screwdriver. Hardness class: 4.8. Unit weight: 3.5 g. DIN 84. Material: carbon steel. Finish: zinc plated. Silver color. Discover our wide range of bolts with a large choice of variable dimensions. It would be better to use a suitable screwdriver or a flat recess bit to screw in and unscrew the bolt. These screws ensure the assembly of two elements in a rigid and reliable manner. An incontestably necessary detail: bolts are essential consumables for fixing, fitting, connection, assembly, tightening, assembly, connection, work , professional and domestic tasks. Very widespread in construction, assembly, interior and exterior fittings. Please note: the possible use of washers /not supplied/ helps prevent loosening of the nut and surface injuries. Application: DIY, industrial, domestic, in the areas of small jobs at home, carpentry, mechanics, and many others.