*Duff Norton has provided special actuators rated at 300 tons and 350 tons for certain applications. Actuators at these capacities are provided under specific Duff Norton / customer agreement as to the actuator’s performance parameters. Please contact our Application Engineering group for more information.

Note: All actuator units can be supplied with standard raises up to 24 inches. Special raises up to 20 feet are available upon request. Closed height dimensions may increase for actuators supplied with bellows boots.

• Because the Duff-Norton machine screw mechanical actuator is produced in many standard models with a wide range of capacities, there is a standard model for almost any requirement. Models can be furnished to 350 Tons capacity.
• Operated manually or by means of gear motors, machine screw actuator models can be used singly, in tandem or in multiple arrangements.
• Since most capacities have a uniform lifting speed, added economy can be realized in raising unevenly distributed loads by operating the different capacities in union.
• Most Duff-Norton machine screw actuator models with higher ratios are self-locking and will hold heavy loads in position indefinitely without creep.
• They can be used to push, pull, apply pressure and as linear actuators. They are furnished with standard raises in increments of 1 inch.
• Depending upon size and type of load, models are available with raises up to 20 feet.