Abstract: A piezoelectric actuator assembly allows maximization of the cross-sectional area of a piezoelectric driver assembly such that axial stiffness of the actuator assembly is substantially increased. The actuator assembly is coupled to an application structure and includes the piezoelectric driver assembly having a stack inboard end longitudinally extending in an inboard direction with respect to the application structure. The driver assembly also has a stack outboard end longitudinally extending in an outboard direction with respect to the application structure. The driver assembly further provides a longitudinal displacement in response to an applied voltage. The actuator assembly also includes an amplification arm having an arm outboard end coupled to a load. An outboard hinge mechanism rotatably couples an arm inboard end of the amplification arm to the stack outboard end such that the arm outboard end extends in the outboard direction.