Noncaptive Size 14 lasts several million cycles and incorporates engineering thermoplastics in rotor drive nut. Stainless steel Acme lead screw runs axially through center of motor and is restrained from rotating. As internal threaded rotor revolves, lead screw moves axially without rotating. Hybrid actuator comes in resolutions ranging from 0.00012-0.00192 in. per step and delivers 50 lb thrusts without compromising long life or cost.