Motorized lead screw linear actuators use a threaded screw and mating nut to convert rotary motion into controlled, precise linear movement, and are driven by NEMA hybrid stepper motors for accurate, programmable positioning. The LS Lead Screw Motor Series Actuators from PBC Linear integrate precision-rolled lead screws with patented Constant Force Technology anti-backlash nuts to maintain consistent preload, reduce play, and deliver reliable positioning accuracy over time.
The non-captive variety of systems allow the lead screw to move freely through the motor instead of being axially fixed within the motor assembly. Depending on the application, the screw may be supported or fixed at both ends while rotating, allowing the motor and attached load to travel along the screw. This is the recommended configuration from PBC Linear. In other mounting arrangements, the motor may remain stationary while the lead screw both rotates and moves axially through the motor.
This flexible motion arrangement supports compact layouts and adaptable integration, especially in space-constrained applications where either the screw, the motor/load, or both may appear to move relative to the machine frame. The PTFE-lined nut promotes smooth thread engagement, lowers friction, and helps minimize wear, contributing to longer service life and stable performance.
Available in NEMA 11, 14, 17, and 23 frame sizes, these actuators cover a wide range of speed, load, and resolution requirements. Stepper motor control enables easy reversal of motion and repeatable positioning cycles, making the LSM series well suited for compact automation, medical devices, electronics manufacturing, and other applications where precision, low backlash, and long-term reliability are critical. For optimal performance, non-captive actuators are often paired with a linear guide to improve stiffness, alignment, and overall load capacity.
