The keys and the plays in the connection tree/hub remove.
The standard SIAM RINGSPANN is used everywhere in Europe.
It is the only one with being labellized Standard System Concept SC, these initials guarantee the European origin of the component, and mean that it is manufactured harmonizes some with the specifications of the VDMA as regards intensities of pressure, of coefficients of friction, and quality of screw to transmit a couple completely and without plays.

10 families of expansible products of assemblers of diameter 10 to 600
Couples to 1.472.847 Nm

Discs of assembly for short ultra ranges with a perfect concentricity.