Duff-Norton

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Duff-Norton – Industrial Screw Jacks, Linear Actuators, and Rotary Unions

Since 1883, Duff-Norton has earned a reputation for reliable, high quality products that meet the industrial lifting, positioning, and transfer needs of our worldwide customers. Both standard and custom designed products are subjected to the same rigorous testing throughout the design process to assure maximum performance and quality. Duff-Norton has been ISO 9001 registered since 1994, and practices and conducts lean initiatives regularly.

Duff-Norton Screw Jacks

Along with sister companies, CM Engineered Products GmbH and Duff-Norton Europe, Duff-Norton is the largest manufacturer of motion technology products in the world, providing both motion technology and systems technology solutions.

Duff-Norton pioneered the modern day screw jacks and many of their features such as anti-backlash, ball screw, and close-mounted motorized and controlled options.

  • Duff-Norton linear actuators and electric cylinder product lines are broad, comprehensive, and packaged with the latest features.
  • Duff-Norton’s large selection of acme and ball screws and nuts are uniquely and completely packaged with modern day drives and control components.
  • Duff-Norton rotary unions offer first class media transfer functionality across a very broad application range.

All Duff-Norton products are widely used throughout the process and related industries such as metals, chemicals, mining, material handling, agriculture, satellite, defense, and many more.


Screw Jacks

Duff-Norton screw jacks (mechanical actuators) include mechanical machine screw and ball screw actuators (ranging in size from 1/4 ton to 350 tons), stainless steel machine screw actuators, micro-miniature actuators, high duty cycle actuators, motorized machine screw and ball screw actuators, electric cylinders, and motor control systems.

Accessories include miter gear boxes, c-face motor adapters, limit switches, transducers, visual and digital position indicators, couplings, ball screws and ball screw systems, and locking rings. Screw jacks are also used for raising and lowering maintenance platforms, opening and closing air dampers, oven doors and sluice gates, and adjusting tooling machine beds, cable tension and workplace tables. In addition to the broad range of applications and industries for mechanical actuators, they are also used as alternatives to hydraulic and pneumatic systems.


Linear Actuators and SuperCylinders

This Duff-Norton product line of actuators features load capacities ranging from 27 pounds to 25 tons, gear- or belt-driven, acme screw and ball screw systems with various AC and DC input voltages. Duff-Norton linear actuators and SuperCylinders are specially-designed for a variety of commercial and industrial applications. These actuators are used for opening and closing, tilting and pivoting, lifting and lowering, and positioning.

Applications include gates, dampers, oven and processing tank doors, antennas, orthopedic tables and other medical equipment, ergonomic furniture, and agricultural equipment, etc. Linear actuators are now being used in place of pneumatics and hydraulics when high maintenance and environmental problems, like leaking hydraulic oil, are a concern.


Rotary Unions and Swivel Joints

Rotary unions transfer media (water, steam, air, oil, hydraulic fluid, etc) from a stationary source to rotating machinery, such as a drum or an indexing table. They are used in process industries such as; paper, printing, rubber and plastics, textile, and chemical. Rotary unions are also used on cranes, machine tools, and many other applications.

Duff-Norton rotary unions are used to provide heating or cooling media like steam, hot oil, water or coolant to control the surface temperature of a drum or roll, to transfer air or hydraulic fluid to moving components or to add fluids to mixers while in motion. Rotary unions, rotary joints, and rotating joints ranging up to 750 psi and up to 5,000 RPM are available.


Acme and Ball Screws and Nuts

Duff-Norton has been manufacturing acme and ball screws and nuts for decades, and is now applying those years of experience to bring you an expanded assortment of screws and nuts for your applications.

Acme screws and nuts offer excellent load ratings and centralizing class screw and nut assemblies. Ball screws and nuts offer excellent load ratings, 90% efficiency, and long predictable life ratings.

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