Used to join different organizations in two axes (drive shaft and the driven shaft) to rotate together so that torque transmission machine parts. In the high-speed heavy-duty power transmission, some coupling also cushioning, vibration and improve performance shafting dynamic role. Couplings consists of two halves, namely with the driving shaft and the driven shaft coupling. Most general power machine by means of a coupling and working machine coupled. Coupling intermediate connecting member of each movement mechanism, the normal operation of its various sports organizations have a direct impact,