Duff-Norton Heavy-duty Linear Actuators

Duff-Norton manufactures the broadest range of high-capacity electric cylinders ranging from 2 to 25 tons. All our electric cylinders are available in clevis or trunnion mounting; offset, right angle or parallel in-line mounting; with speeds up to 6.3 in/s (160 mm/s).

Duff-Norton heavy-duty electric actuators are used for opening and closing, tilting and pivoting, lifting and lowering, and positioning.

Browse through our SCW, SNC and SCD SuperCylinder series of electric lift cylinders to find the right option for your application or reach out to one of our engineers to start a conversation about your specific needs.


Features & Benefits for Hazardous Conditions

Duff-Norton now offers new models of our popular SCN and SCW Series SuperCylinders with motors and limit switches rated for hazardous locations.


Motors are available for Class 1, Group D and Class 2, Group F & G environments (as defined in NFPA Publication 70).

Limit switches are marked either NEMA 7 for use in Class 1, Group D locations, or NEMA 9 for use in Class 2, Group E, F & G locations (as defined in NFPA Publication 70).

The SCN Series combines the ball screw driven translating tube system with trunnion mounted high-efficiency helical or helical-bevel, oil filled gearboxes. The SCW Series combines a ball screw or ACME screw driven translating tube system with our existing clevis mounted worm gear actuators.

Both Duff-Norton SuperCylinder series use a precision guided translating tube system to broaden application capabilities. A ground and chrome plated translating tube sliding in polymeric bearings produces excellent resistance to buckling. This lets SuperCylinders achieve stroke lengths much greater than are possible with conventional double clevis mounted mechanical actuators.

Enclosure of the screw by the tube system shields it from environmental contaminants and retains lubricants, requiring less maintenance and allowing longer service. SuperCylinders use hydraulic cylinder grade wiper seals to effectively exclude dirt from the screw area.

The modular concept employed by Duff-Norton for both SuperCylinder series allows an unlimited number of configuration possibilities for tailoring of the SuperCylinder to an application. The selection of available gear ratios is unmatched by any similar product. This exceptional choice of ratios allows precise tailoring of the actuator speed and load specifications. Many additional motor and ratio options are available to meet specific capacity, speed, or life requirements.

  • Speeds Up To 379 in/min
  • Capacities Up To 50,000 lbs
  • Strokes Up To 161 inches
  • Ball Screw or Acme Screw
  • Clevis Mounting or Trunnion Mounting
  • Aluminum Bronze Worm Gears (SCW Series)
  • Continuous Duty Ratings (SCN Series)
  • Low Power Requirements (SCN Series)
  • Helical & Helical Bevel Gears (SCN Series)

SuperCylinders do not incorporate any protection against mechanical overloading, either externally applied or through internal jamming. In applications where overloading is a possibility, appropriate electronic or mechanical devices should be incorporated to prevent operation of the actuator if overloaded.

The equipment shown in this catalog is intended for industrial use only and should not be used to lift, support, or otherwise transport people unless you have written statement from Duff-Norton Company, which authorizes the specific actuator unit as used in your applications suitable for moving people.


Download the Duff-Norton Super Cylinder Design Guide at right>>