Duff-Norton Screw Jacks

Screw Jacks - 1/4 to 350 Ton

1/4 to 350 ton capacity. Acme 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.

Duff-Norton offers a complete line of both standard and custom engineered machine screw actuators for applications up to 350 tons.

• Machine Screw Actuators can be controlled accurately for positioning within thousandths of one inch.
• Models featuring higher gear ratios are inherently load holding as long as the actuator is not subject to vibration
• 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.
• All actuators are designed and built to be positive acting, for accurate response to motive power.