Screw Jacks - Metric 5kN - 500kN

Screw Jacks - Key Features & Benefits

Duff-Norton offers a comprehensive line of both standard and custom engineered metric machine screw jacks for applications up to 500kN. Duff-Norton metric machine screw jacks are produced in many standard models to ISO Standards with a wide range of capacities. There is a standard model for almost any requirement.

Machine screw jacks 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.


Screw Jacks can be used to push, pull, apply pressure as linear actuators. They are furnished with standard raises in increments of 1mm. Depending upon size and type of load, models are available with raises up to 6000mm.

Precise Positioning

Precise positioning can be controlled accurately within 0.025mm

Self Locking

Duff-Norton metric machine screw actuator models with higher ratios are inherently self-locking and will hold heavy loads without creep as long as the actuator is not subject to vibration.

Manual or Motorised Screw Jacks

Operated manually or by means of gear motors, machine screw actuator models can be used singularly, 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 unison.

Uniform Lifting Speeds

Since many actuators feature the same gear ratios different capacities can be used in the same application to lift unevenly distributed loads with uniform speeds

Positive Reliable Operation

All actuators are designed and built to be positive acting, for accurate response to motive power