Countersunk Allen screw DIN 7991 M8x35-8.8

Product detailed description

The countersunk head screw with internal hexagon according to DIN 7991, also corresponding to ISO 10642 and ČSN 021144, is intended for applications requiring a flat surface of the joint. This type of screw is ideal for metal and structural applications where it is necessary to ensure a strong and reliable connection without protruding heads, which allows for an aesthetic and functional solution.

The screw has a metric thread M8 with a length of 35 mm and a thread pitch of 1.25 mm. The thread diameter is M8, while the head diameter (dk) is 16 mm. The head height (k) is 4.9 mm and the height of the countersunk part (h) is 3.5 mm. The screw is equipped with a 5 mm internal hexagon, which allows the use of a standard Allen key for assembly and disassembly.

The screw material is steel of strength class 8.8, which means that it has a minimum yield strength of 640 MPa and a minimum tensile strength of 800 MPa. The screw has no surface treatment, which is suitable for applications where additional corrosion protection is not required, or where additional treatment is planned according to specific project needs.

The countersunk shape of the head with an angle of 90° allows for complete embedment in the material, thus achieving a smooth surface of the joint. This type of screw is often used in mechanical engineering, construction and furniture production, where a combination of strength and aesthetic appearance is important.