Service & Repairs

Mechanical Actuators
Mechanical Actuators  


Machine Screw Actuators
Machine Screw Actuator photo

We offer a complete range of Duff-Norton standard and custom engineered machine screw actuators for applications up to 350 tons. Actuators covering the majority of applications are available locally from our Australian stock and engineered to suit your specific configurations and requirements.

Machine screw actuators offer positive mechanical action, precise positioning, and uniform lifting speeds. Standard configurations include upright or inverted units with translating or rotating lifting screws, and top plate, threaded, or clevis ends. The anti-backlash option reduces vertical backlash resulting in smooth, precise operation and minimal wear.

Stainless Steel Actuators

For harsh environments, Duff-Norton offers a complete line of stainless steel machine screw actuators in standard and special configurations for loads up to 100 tons.

Duff-Norton Stainless Steel actuators incorporate all of the same features as Duff-Norton's standard machine screw actuators, but can be used in severe environments where other materials are inadequate. All exposed surfaces are made of 316 stainless steel including the lifting screw, housing, shell cap, worm and dust guard. Options include: anti-backlash and keyed lifting screws for translating screw models.

Ball Screw Actuators
Ball Screw Actuator photo

Duff-Norton Ball Screw actuators come in many standard models, or can be custom designed for any application up to 50 tons.

Duff-Norton Ball Screw actuators provide high efficiency and high speed in one linear positioning package. The positive action of the low friction ball screw and nut design provides longer life at load and requires less power to achieve a specified thrust. Ball screw actuators can be used individually, in tandem or as part of a larger mechanical system. With lifts up to 20 feet, Duff-Norton Ball Screw actuators offer the perfect solution to many linear positioning applications.

Micro-Miniature Actuators
Micro-Miniature Actuator Photo

Duff-Norton Micro-Miniature actuators provide extreme precision in a compact package. Accurate to within .001 inch, and equipped with anti-backlash nuts to minimize vertical backlash between the screw and worm gear nut, these units are available with either balanced, or continuous dial readings for perfect positioning every time.

Standard Duff-Norton Micro-Miniature actuators come with aluminum shell caps and housings and include stainless steel worms and lifting screws. These actuators are also available with stainless steel shell caps and housings.

High Duty Cycle Actuators
High Duty Cycle Actuator photo
Duff-Norton High Duty Cycle actuators are specifically designed for continuous operation. The gear set operates in an oil bath for thermal efficiency and long life. With rated load capacities up to 13,000 pounds, and mechanical efficiency as high as 70%, High Duty Cycle actuators provide efficient, continuous service.


Duff-Norton Actuators are also available in true metric dimensions.

Configurations Available
Screw Ends
 Upright Screw Configuration photo  Upright Rotating Screw configuration photo Inverted Screw Configuration photo

Top plate screw end photo

Clevis screw end photo

Threaded screw end photo

Plain Screw end photo
 Upright Translating Screw Upright Rotating Screw Inverted Translating Screw Top Plate Clevis Threaded Plain
Also Inverted Rotating Screw *A wide variety of special screw ends are available.


AC Motor Controls
Loaded Control Box Duff-Norton offers constant speed AC motor Control Systems for machine and ball screw actuators. These new control systems provide the option of jogging-inching, or maintained operation, when specified as part of a Duff-Norton Linear Positioning System. Numerous options are available including short circuit protection, pilot lamps, illuminated push buttons, and loose limit switches,as well as single and three phase power up to 575 VAC. Duff-Norton can be your single source for complete linear positioning systems.


Actuator Applications:

  • Tooling Machine Bed Adjustment
  • Platform & Table Lifting
  • Steel, Rubber, Plastics ,Textile Skewing Roll Adjustments
  • Valve Control Actuation, Pinch, Gate and Ball Valve
  • Slide Gate Actuation
  • Packaging Machinery
  • Accurate Positioning Applications & Many More


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