Spring Coupling, hardened high alloy steel, compacted in the surface area molecular structure and long life spring revealed by an inimitable design. The coupling type is easy to choose, has a wide and numerous options (11 types 25 sizes). Among all the couplings, the first investment and maintenance cost for high torques is the lowest and the 508 mm (20 inch) max. It is the diameter that it can be opened and has a wide usage area up to 850,000 Nm torques.