CNF couplings are available in a range of torsional stiffness characteristics. The critical rotational speed of the drive system should be normally placed below the operation speed. By using drive inserts of various shore hardness, it is possible to adjust the resonance speeds & torque characteristics, so that a suitable frequency ratio can be achieved, thus reducing vibrations.

CNF couplings come with the new generation of NENFLEX drive insets which are the subject matter of a patent.

CWF couplings come with the specially designed 'T' shaped drive insert, which eliminates the need for internal rings in the coupling, which makes space available to mount locking plates if required.