Bellows Couplings –  Like the Beam coupling, the Bellows coupling is almost identical in features and weaknesses. The Bellows can run at high speed but can only flex to 6 degrees, again making it another coupling that will wear quickly is any change to the angle of misalignment occurs, either intentional or not.
The same torsional stiffness as the Beam, the Bellows is a high speed coupling but with its low torque output and small size makes its use limited.