Bellows-type flexible couplings from NBK allows for eccentricity, angular misalignment, and end-play. The bellows is stainless steel.
MBB couplings work extremely well with servomotors and stepper motors, but are inappropriate for pairing with general-purpose motors.
MBB couplings are zero-backlash couplings, though slightly less forgiving of misalignment than come other compliant types.
Bellows-type flexible couplings: Selection example
Note that NBK bellows work well in actuators, high-precision XY stages, semiconductor devices, and to connect encoders to motion axes.
With a shaft diameter of φ10 and load torque of 2 N・m, the suitable size for an MBB bellows coupling is MBB-27C.
Note that one last parameter to consider is eccentric reaction force. This is a force generated when making a coupling in eccentric condition. As the eccentric reaction force becomes smaller, the force acting on the shaft bearing also becomes smaller.