Available in captive, noncaptive, and external linear designs, Series 28000 (Size 11) has resolutions from 0.000125–0.002 in. per step and can also be micro-stepped. Double-stack hybrid linear actuators occupy 1.1 in. square space and deliver up to 30 lb thrust. Elements of construction include engineering thermoplastics in rotor drive nut and stainless steel acme lead screw.