The nut is painted black with an electrophoretic technique. Its advantage is the uniform distribution of the paint layer and the exact coverage of imperfections. It also provides corrosion protection.
The metal alloy used to make the wheel nuts ensures sufficient strength of the threaded connection. The user can securely attach the wheel with the force recommended by the vehicle manufacturer when tightening [Nm]. The wheel nut also ensures a secure fit of the key during the installation of the wheel.