Screw Jacks
For Any Industrial Application.

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Whether you need to adjust the height of a conveyor system or position a piece of equipment, we offer a range of screw jacks to suit your need.

Choose from our traditional J-Range designs or build expansive lifting systems with our intelligently-engineered cubic range.

Use our free CAD Configurator tool to configure your preferred screw jack design, download CAD models or request a quote.

CAD Configurator
Screw Jacks

Mini Cubic

2.5kN Lifting Capacity

It may be the baby in the range but don’t let it's compact size fool you. Measuring just 50x60x50mm, this small but mighty Screw Jack is capable of lifting loads of up to 2.5kN and is ideally suited for manual adjustment.

Click to read more about the Mini Cubic below or launch the CAD configurator tool to design a model fit for your specific needs.

Read More About The Mini CubicLaunch CAD Configurator
Mini Cubic Screw Jacks
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Cubic

5kN - 50kN Lifting Capacity

Our Cubic Screw Jacks come in a wide range of sizes and offer a variety of different performance configurations. Made from anodised aluminium with high-grade steel and stainless steel fittings, this design is ideal for lifting or positioning a load.

Click below to read more or launch our free CAD Configurator or System Builder tools to start modelling your own precise designs.

Read More About The CubicLaunch CAD ConfiguratorLaunch System Builder
Cubic Screw Jacks
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Cubic Actuator

5kN - 50kN Lifting Capacity

Our Cubic Actuator Screw Jacks are perfect for short travel applications or situations that require protection from water and debris ingress. The lifting screws have a plain ground section that allows the use of a wiper seal to keep dust and moisture out whilst retaining internal lubricants.

Click below to read more or launch our free CAD Configurator tool to model and download your own precise design now.

Read More About The Cubic ActuatorLaunch CAD Configurator
Cubic Actuator Screw Jacks
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Cubic Ball Screw

5kN - 50kN Lifting Capacity

When power, high speed, high duty cycle and repetitive positioning are required, our Cubic Ball Screw Jacks provide the ideal solution. A high efficiency ball screw provides a range of possible travel speeds and configurations.

Click below to read more or launch our free CAD Configurator tool to model and download your own precise design now.

Learn More About The Cubic BallLaunch CAD ConfiguratorLaunch System Builder
Cubic Ball Screw Jacks
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J Range

5kN - 1000kN Lifting Capacity

Our classic J-Range models are commonly used as industrial screw jacks - capable of lifting weights of up to 1000kN.

With a comprehensive range of configuration options - from load capacity to travel lengths and repeatability - the design possibilities are endless. Click below to read more about the J Range or view product data sheets.

Learn More About The J Range
Standard Screw Jack Range
Screw Jack Working Animation
          - Screw Jack Working Animation

A Screw Jack (often referred to as a Jack Screw) is a device used to lift or position heavy objects, components, or platforms by exploiting the mechanical advantage of a lead screw.

They are a popular tool in industry that allows us to leverage an energy-efficient geared lead screw to amplify axial force. Loads of greater magnitude can be moved by converting motion from rotational to linear. The linear motion they provide is achieved via a lead screw which runs through a worm wheel, mated to an input worm shaft. As the attached input drive shaft rotates (either manually by a hand crank or electric motor), it forces the worm gear set inside to rotate. As the wheel turns it translates a lead screw along its internal thread - thus delivering the desired linear movement.

Screw jacks are used around the world for many different industrial applications. They are often more cost effective to manufacture than alternative pneumatic or hydraulic solutions and their simplicity allows for a reduced footprint. They are easy to maintain and, without the need for harmful fluids, there is no risk of hazardous spillages or leaks. They can also easily be synchronised with multiple other units, through the use of driveshafts and gearboxes, to provide a single, modular system. 

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Lead Screw Variations

There are three main variations, that we can offer, when choosing a suitable method of translation. Each lead screw and paired 'nut' will have specific advantages and disadvantages which must be analysed to ensure proper operation and performance. Your choice depends on your objective and the nature of your actuation needs.

Trapezoidal Screw

A trapezoidal lead screw allows for translation of motion from rotational to linear. This is achived through continuous contact of two mating threads. The friction between these threads is usually sufficient to provide self-locking properties and prevent back driving. This is dependent on the lead angle, number of starts, and any external conditions the set-up is subjected to, such as vibration.

Ball Screw

In this design, continous contact of two threads is replaced with a ciruit (or several) of ball bearings inside of a ball-nut. Ball screw jacks offer strong operational efficiency, higher travel speeds and increased durability under load due to the lower friction coefficients. Rolled or ground variations are available depending on your precison requirements. The high precision machining involved in their construction means they are expensive to manufacture. Their high efficieny means they are not inherently self-locking and may require an additional locking mechanism or brake to prevent back-drive.

Ball Screw

Roller Screw

Roller screws operate in a similar fashion to ball screws but rather than using ball bearings, high precision ground satellite rollers orbit the lead screw. These rollers provide a large number of contact points compared to other lead screw designs, enabling heavier loading whilst maintaing a very high efficiency.

Their smooth translation allows them to provide superior positioning accuracy and enable very high running speeds. The complexity of their construction increases the cost of these units but they will provide the optimal solution in a scenario where high load, travel speed, and precision are paramount.

Motion Variations

All models of Screw Jack and Actuator employ one of the following three motion types.These variations define the way that the lead screw reacts upon connection with the rotational input. Each method of translation will have its benefits over the others in any given scenario.

Translating

In a standard translating screw jack, the rotational input from a worm wheel acts directly on the lead screw, causing the screw to spin if not restricted. If the end of the lead screw , and the jack/actuator body is then fixed in position, the initial rotational input is translated into linear motion as the screw will travel along the thread and through the worm wheel.

Translating Keyed

The dynamics of a keyed setup are similar to a standard translating arrangment but the lead screw itself is instead ‘keyed’ so that it cannot rotate. This restriced motion ensures that all motion is linear, regardless of the mounting arrangement. Keying can be achieved in a number of ways such as using guide rails, linear keyways, or  keying blocks. This type of motion is important if the lead screw end is not to be fixed to the load being lifted.

Rotating

With a rotating arrangement, the lead screw is fixed to the worm wheel and hence only rotation can occur. Linear travel is then achieved using a travelling nut. If this nut has a fixed rotation, it will travel along the lead screw thread,however if not restricted, it will rotate with the worm wheel. 

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To build a modular lifting mechanism, the jacks themselves need to be connected to an electric motor or manual input. The motor or hand-crank provides the initial rotational energy which is translated and then converted into linear motion by the connected units.

Modular Screw Jack System

Most systems are comprised of several jacks linked together by drive shafts, couplings and bevel gearboxes. This modular style of connection is extremely flexible as design engineers can customise a system to suit their needs – including different lifting actions, travel speeds, and load capacity.

Modular System Design

Modular System Design

Use our free System Builder tool to design your own, customised, screw jack lifting system.

Learn More
Cubic Bevel Gearboxes

Cubic Bevel Gearboxes

Integrate bevel gearboxes into your system and drive multiple screw jacks from a single input.

Browse Gearboxes
Cubic Accessories

Cubic Accessories

We also supply plates, drive shafts and couplings to help build your custom system.

Browse Accessories

Strength in design

All products designed and manufactured in the UK.

We have been manufacturing components in the UK for over 40 years. All products are developed and dispatched from our site in Bristol - supported by a team of experienced design engineers, production technicians and the latest manufacturing technology.

Learn More About Kelston Actuation

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