Rodless electromechanical actuators support and transport loads to their desired locations. Unlike ram-style linear actuators which typically push and pull load, rodless actuators are best suited for transporting loads, particularly at long stroke lengths.

    With their high load and moment bearing capabilities, our rodless actuator units are guaranteed to be the optimum solution in terms of performance and affordability. All rodless actuator products are manufactured to the highest of standards and can be customized to suit specific customer and application needs. Our rodless actuator offering includes belt driven and screw driven options.



    • Standard stroke lengths up to 11 meters (~36 feet)
    • Capable thrust loads up to 12kN (~2,700 lb-f)
    • Capable travel speeds up to 10m/s (~33 ft/sec)
    • Positional repeatability up to of 0.01mm (~0.0004”in)
    • Significant moment loading capabilities
    • Wide variety of frame sizes, drive types, and guidance systems
    • Patented self-adjusting sealing cover strip to prevent material intrusion
    • Customizable designs, stroke lengths, and accessories


    Belt driven actuators use the rotational energy of a motor to turn a pulley which drives a belt. The belts are usually constructed of a composite of polymer with steel wire reinforcements. Belt driven unit use a carriage that is attached to the belt as a means of transferring linear movement to the load. Some advantages of a belt driven system are the abilities to achieve long stroke lengths, high capable travel speeds, and a high degree of accuracy.

    Our line of belt-driven rodless actuators are ideal for applications that warrant longer strokes, higher travel speeds and appreciable moment loading capabilities at an economic price point. Both the WH SPEEDLine® and WM POWERLine® ZRT units offer a robust toothed belt drive system which provides consistent and reliable linear motion.

    WH (SPEEDLine) Linear Units

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      The WH (SPEEDLine) linear units are used for single-axis solutions and can be combined in two and three-dimensional systems (X-Y-Z). The light-weight design combined with the unit’s small footprint allow high dynamic and static load ratings in a compact package. This makes these units particularly capable in Z-Axis applications.


      - WH40
      - WH50
      - WH80
      - WH120
      - WHZ50
      - WHZ80


      - Maximum speed of 10 m/s (33 ft/sec)
      - Maximum acceleration 40 m/s2 (131 ft/s2)
      - Repeatability of ± .05 (0.002 in.), even at high feed forces
      - Maximum feed force 5000 N (1,124 lb-f)
      - Maximum payload 9,300 N (2,090 lb-f)
      - Maximum moment load of 930 Nm (209 lbs-f) on carriage
      - Steel reinforced belt
      - Rubber wipers to protect linear guide from debris
      - Central system lubrication point
      - Light-weight total construction
      - Manufactured in the U.S.

    WM (POWERLine) ZRT

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      The WM (POWERLine – formerly Wiesel POWERLine) ZRT combines the high travel speeds of the toothed belt drive with the powerful, fully integrated ball bearing guide of the POWERLine® series. The -370 option boasts an attractive price reduction with its shorter guide system and compact power bridge.


      - WM60-370 ZRT
      - WM80-370 ZRT
      - WM80 ZRT


      - Patented self-adjusting sealing cover strip to prevent material intrusion
      - Integrated ball-bearing guide system to handle higher moment loads
      - Steel reinforced toothed belt drive
      - Manufactured in the U.S.


    Screw driven actuators also use the rotational energy of a motor to provide force and motion, but in this case the motor spins a screw rather than a pulley. This rotation causes a mating nut (attached to a load mounting carriage) to travel along the length of the screw. Hunt Valve’s screw driven rodless actuators utilize a patented screw support system that supports the screw at regular intervals along its length. This eliminates the concern of screw whip and allows these units to achieve maximum travel speed, even at significant stroke lengths (30ft or more).

    Screw driven designs are typically used in applications where a high level of accuracy and control is required. These unit types are capable of performing 100% duty cycles, even at high loads and long stroke lengths.

    Fairbanks Morse Defense and Hunt Valve offer the WM POWERLine and WV DYNALine actuators in a range of sizes engineered to meet exacting demands.

    WM (POWERLine)

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      The POWERLine series (formerly Wiesel POWERLine) utilizes an enhanced internal guide system differentiated by circulating ball bearings which travel on internal hardened steel rails. This, along with the standard precision drive screw, provides a comprehensive solution when a mix of power, speed, and precision is needed.


      - WM40
      - WM60
      - WM80
      - WM120


      - Maximum speed of 2.5 m/s (8.2 ft/s)
      - Repeatability up to ± 0.01 mm (0.0004 inches)
      - Maximum feed force of 12,000 N (2,698 lb-f)
      - Maximum payload 6000 N (1,348 lbs)
      - Maximum moment load of 600 Nm (134 lbs-f) on carriage
      - Compact guide and carriage configuration available (-370 option)
      - Self-sealing protective cover strip
      - Traveling screw supports to prevent screw whip at high speeds and extended lengths
      - Manufactured in the U.S.

    WV (DYNALine) Linear Guides

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      In some cases, extremely high moment load capabilities are the primary application requirement. The DYNALine is an optimized version of the POWERLine (formerly Wiesel POWERLine) series of screw-driven rodless actuators designed to meet this demand by coupling the primary drive elements with external linear guides. This allows increased moment load capabilities to be realized, even at high speeds and long stroke lengths.


      - WV60
      - WV80
      - WV120


      - Maximum travel speed of 2.5 m/s (8.2 ft/s)
      - Repeatability of +-0.01mm (0.0004 inches)
      - Maximum feed force of 12,000N (2,698 lb-f)
      - Dual pre-tensioned ball nuts on all units
      - Self-sealing protective cover strip
      - Traveling screw supports to prevent screw whip at high speeds and extended lengths
      - Manufactured in the U.S.


    Parts & Service

    Fairbanks Morse Defense offers an extensive portfolio of services to optimize performance, ensure reliability, and extend the life of your fleet - from the day its commissioned and for the many years that follow. Learn more about what our custom solutions can do for you.

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    Commercial Solutions

    In addition to the defense industry, Fairbanks Morse Defense also works with the commercial industry. Our commercial customers can include municipal and nuclear power plants, hospitals, universities, and international stationary power applications.

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