Captive Lead Screw Linear Actuators

Captive lead screw linear actuators are integrated motorized assemblies that use a non-rotating lead screw to move and accurately position loads along a straight path. An internal rotating drive nut converts motor rotation into linear motion, causing the lead screw to extend or retract from the motor housing to push or pull the attached load. One end of the screw remains captured within the actuator, providing mechanical stability while limiting the available stroke length. This configuration makes captive lead screw actuators particularly suitable for compact applications requiring short, controlled linear movements and accurate load positioning.

Available in five NEMA frame sizes—08, 11, 14, 17, and 23—these captive lead screw actuators feature PTFE-coated screw and nut threads to reduce friction, minimize wear, and resist contamination. Integrated angular contact bearings within the motor housing increase thrust capacity, reduce deflection, and control runout. Factory-preloaded bearings minimize axial clearance and help maintain consistent positioning accuracy and low backlash throughout the actuator's service life. Optional Smart Motor Technology can increase output torque by up to 50%, enabling faster cycle times and improved productivity without increasing the actuator footprint.

• Five frame sizes: NEMA 08, 11, 14, 17, and 23
• Multiple lead screw and nut combinations available per frame size
• Available with standard and anti-backlash nuts
• Three nut styles offer design flexibility: round, square and triangular
• Larger bearing design increases thrust capacity and service life
• Preloaded bearings eliminate axial play for improved positioning accuracy
• Optional Smart Motor Technology for up to 50% more torque

Frequently Asked Questions