Here we have the M5x20 black countersunk socket head screw 10.9, DIN7991, a high-strength fastener designed for areas with high mechanical stress. Thanks to the countersunk head with a height of only 2 mm, you get a completely smooth and flush surface after assembly, which you will especially appreciate on moving machine parts or where a protruding head could obstruct.
This screw is supplied self-colour (without surface treatment), and its main advantage is its classification in the extraordinary strength class 10.9. It can therefore handle application in demanding engineering structures where high shear resistance and joint reliability under heavy loads are required.
Technical advantages and details
- Fully threaded M5 (20 mm): Offers the assurance of reliable tightening and maximum variability when fastening thin and thicker parts together.
- Strength class 10.9: Provides excellent load capacity in statically and dynamically stressed joints of your machinery.
- Hexagon socket (key size 3): Allows precise and safe transmission of tightening torque using a standard Allen key without the risk of slipping.
- DIN 7991 and ISO 10642 standards: Guarantee strict compliance with manufacturing tolerances and trouble-free assembly.
Before installation itself, we recommend verifying the correct angle and depth of the countersink in your material so that the screw head seats perfectly and the joint functions correctly. Given the design without anti-corrosion surface treatment, remember to apply additional protection with a suitable preserving oil when used in a humid environment.
