MHX-A-PDM series mounts are piezomotor-driven, all-stainless steel holders made for standard 12.7-mm (0.5-in.), 25.4-mm (1-in.), 50.8-mm (2-in.), and 101.6-mm (4-in.)mirrors. They feature ultra-high resolution piezomotor actuators and a hollow-frame design that not only provides a higher moment of inertia to maximize stiffness but also thinner, reduced-mass sections allowing it to reach thermal equilibrium faster than traditionally designed mounts. Thermal repeatability tests validate the effectiveness of the new frame design, showing lower deflection and equivalent repeatability against rival mounts. The MHX mount is loaded with additional features like center-post mounting, adhesive wells, and keying pin slots, all in the industry’s most compact and affordable stainless steel mount.