Curvic coupling possesses the following advantages:

Features of the end-toothed with the circular-arc, special tooth shape with wide meshing surfaces, long service life, high accuracy, good automatic centering, transmitting bigger torque, using the hirth coupling, the complicated monolithic structure can be divided into several simple structure, therefore it is convenient for designing, manufacturing, assembling so it has been being used widely. As the contact surface is concave and convex arc shape so there is on the face stress instead of on the point either the line therefore there will be no corner chipping and edge breakage appearance like the straight tooth.