Countersunk Allen screw DIN 7991 M4x20-10.9

Product detailed description

The DIN 7991 M4x20-10.9 Allen countersunk screw is a structural element designed for applications where a flat surface of the joint is required. This screw has a countersunk head with an internal hexagon, which allows it to be embedded in the material so that the screw head is flush with the surface. This minimizes the risk of catching on protruding parts and increases the aesthetic value of the joint.

The screw is made of steel of strength class 10.9, which means that it has high tensile strength and is suitable for demanding mechanical applications. Strength class 10.9 indicates a minimum yield strength of 900 MPa and a minimum tensile strength of 1000 MPa, which guarantees a reliable and strong connection even under high loads. The screw has no surface treatment, which is important to consider in applications where it may be exposed to corrosive conditions.

The screw has a metric M4 thread with a length of 20 mm and a thread pitch of 0.70 mm. The head diameter (dk) is 8 mm and the head height (k) is 2.48 mm. The height of the countersunk part (h) is 1.8 mm and the width of the internal hexagon (s) is 3 mm. The countersunk head is designed with an angle of 90°, which is the standard angle for countersunk screws, ensuring correct embedding in the material.

The screw complies with DIN 7991, ISO 10642 and ČSN 021144 standards, which guarantees its compatibility with other components and systems that are designed according to these standards. These standards define the dimensions, tolerances and mechanical properties of screws, which is crucial for ensuring the quality and reliability of connections in industrial applications. The screw is ideal for metal and structural applications where a strong and reliable connection needs to be ensured.