An actuator device (10) includes a motor (12) and a reduction device (14) operatively coupled to the motor (12) and oriented about a central axis (20). The reduction device (14) is configured to modify an input angle of rotation provided by the motor (12) to an output angle of rotation. Further included is a rotary flexure mechanism (30) that includes a rotary flexure (32) operatively coupled to an output portion of the reduction device (14). The rotary flexure mechanism (30) also includes a plurality of flexure blades (36) coupled to the rotary flexure (32), each of the flexure blades (36) angularly oriented from the central axis (20). The rotary flexure mechanism (30) further includes a diaphragm flexure pair (40,44) operatively coupled to the flexure blades (36). The diaphragm flexure pair (40,44) comprises a rotational and in-plane stiffness greater than an axial stiffness resulting in the rotary flexure mechanism (30) being configured to convert a rotational input to an axial translation.