Screw Jacks

Screw Jacks

Duff Norton produces the most widely used and popular screw jacks worldwide which have been proven in the most demanding linear motion applications. As a leader in the manufacture of mechanical screw jacks Duff Norton guarantees quality, reliability, performance and value for today's demanding industrial applications. Duff-Norton's high quality screw jacks are suitable for a wide variety of uses. They can be employed to lift, pull, move or align any kind of load with perfect synchronization and repeatability.  Operating singularly or in groups connected with shafts, couplings and/or bevel gearboxes.
Machine screw jacks can be driven by a range of motive powers including ac and dc electric motors as well as hydraulic or pneumatic motors. They can also be driven manually or with any other type of transmission.

Duff Norton screw jacks are inherently load holding and can generally support their applied loads without the necessity of any brakes or other locking systems.

A complete package of actuator controls, and power transmission components are readily available.


Documentation

Screw Jacks - Metric 5kN - 500kN

Duff Norton Metric Machine Screw Jacks are produced in many standard models from 5kN to 500kN capacities. 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 - Imperial 1/4 Ton - 250 Ton

Duff Norton Screw Jacks are produced in many standard models from 1/4 Ton to 250 Ton Capacities.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.

Anti Backlash Screw Jacks 1/4 Ton - 150 Ton (Imperial)

Duff Norton anti-backlash actuators reduce vertical backlash resulting in smooth, precise operation and minimal wear. Backlash occurs when the motor driving an actuator reverses its load direction.

Anti Backlash 25kN - 200kN (Metric)

Duff Norton metric range of anti backlash screw jacks offer customers industry's best backlash control on the market. Available in capacities from 25kN to 200kN this anti backlash actuator can also be utilized as a screw jacks with internal safety nut feature.

Stainless Steel Screw Jacks

Stainless steel screw jacks manufactured by Duff Norton offer a complete line of stainless steel machine screw actuators in standard and special configurations for loads up to 100 tons. Duff-Norton Stainless Steel actuators incorporate all of the same features as Duff-Norton's standard machine screw actuators, but can be used in severe environments where other materials are inadequate

Powered Actuators

Duff Norton screw jacks can be motorized and powered by various devices. These may include AC & DC electric motors, Air Motors and manually operated handwheels. Very slow screw jack speeds are achieved via a close coupled gear reducer providing an all in one solution to meet customers linear lifting requirements.

Bevel Gear Jacks

Bevel Gear Screw Jacks eliminate the need for miter gearboxes. Bevel Gear jacks offer higher efficiency and greater speed than other mechanical screw jacks. Bevel gear jacks still provide the benefit of a self-locking screw with no special brake required to prevent the jack from lowering under load. Spiral bevel gears increase strength for higher capacities. Bevel Gear jacks also act as a miter gear box, making them an ideal choice for many multi-jack systems. Output shafts may be specified for mounting motors, limit switches, readout devices and other accessories.

Cubic Screw Jacks

Cubic screw jack that features a compact and versatile cubic housing design. Available in both machine screw and ball screw configurations whilst offering high reliability and performance. Clean surface make these units easy to clean dirty environments. Capacities range from 2.5kN to 100kN.

Anode Jacks

Anode Jacks were developed by Duff Norton in conjunction with the aluminium industry to meet the specific requirements of aluminium production. Duff Norton Anode Jacks feature heavy duty construction based upon their standard screw jack range modified for beam lifting in aluminium pot smelting process. Anode Jacks require larger worm gearing and bearings to handle extra stresses that can occur with frozen aluminium pots.

Micro Miniature Screw Jacks

Micro Miniature Screw Jacks with extremely fine adjustment for loads up to 450Kgf. Equipped with anti - backlash nuts and stainless steel worm and lifting screws for reliable operation in corrosive environments. Duff Norton provide Dial Indicators upon request.