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SCREW JACK Duff-Norton line of screw jacks (mechanical actuators) includes mechanical actuators (machine screw and ball screw) 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.
Controls Analysis Form

Duff-Norton Engineers will be pleased to make recommendations for your specific requirements. There is no obligation for this service - simply complete the form below.

If you would like to discuss your application with a Duff-Norton engineer, call 1-800-477-5002.

If you prefer,  Click Here to print a blank Application Analysis Form, complete the form, and send to Duff-Norton at the fax number or address shown below.

If you would like to send a sketch of your application or design drawings in complete confidence, mail or fax to:

Duff Norton Company
PO Box 7010
Charlotte, NC 28241
800-477-5002 TOLL FREE
704-588-1994 FAX

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If the environment is explosive or hostile, where will the operator be located?

Motor Enclosure

Controls Enclosure

Motor Mounting Other  

Additional Gearing

Orientation (Description)

Controls Mounting    Other  

Control Requirements Volts Phase Hz


Features    in./min2  

Indicators (Specify)

Alarms (Specify)

Communication (Specify)

Limit Switches

Accuracy for Positioning (in.)

Number of Positions

Velocity Regulation

Duty Cycle (From Above)

Acceleration and Deceleration rates (from above)

Line Shaft Accuracy

Load Conditions (from above)

Actuator most appropriate for this application

Controls Needed