A dual-axis flexure gimbal device, such as for a fast-steering mirror assembly, can comprise a flexure spring mass body comprising first and second body sections, a flexure diaphragm that interconnects the first and second body sections, and a central aperture formed through the first and second body sections and the flexure diaphragm. A flexure unit can be situated in the central aperture, and can comprise a plurality of slots defining a plurality of flexures. The flexure diaphragm is operable to bend about first and second rotational degrees of freedom, and the plurality of flexures of the flexure unit are operable to flex about respective first and second rotational degrees of freedom. The flexure unit can comprise a plurality of slots, each having a first slot portion and a second slot portion extending in different directions to define a respective flexure. A method of making the dual-axis flexure gimbal device is provided.