The measuring and control technology requires a high amount of torsion spring stiffness from the coupling to achieve reproducible positioning. At the same time the coupling needs to compensate for displacements without any big forces affecting the adjacent filigree components of the system.  The spacer of our COUNTEX^® made of highly temperature-resistant nylon ensures an almost constant torsion spring stiffness even with high temperatures. The double-cardanic operating principle of COUNTEX^® reduces the restoring forces to a minimum. Nevertheless it has very short dimensions which are excellently suitable for narrow mounting spaces.

REF: https://www.ktr.com/en/products/power-transmission-technology/couplings/backlash-free-servo-couplings/countex-shaft-encoder-couplings/