Knowledge Base

Kelston specialise in the design of screw jack systems. As part of our service we can advise on component selection, equipment layout and control functionality.
  • Electromechanical vs. Hydraulics

    Electromechanical vs. Hydraulics

    Mechanical screw jacks and linear actuators are increasingly becoming the preferred choice of actuation over the equivalent hydraulic or pneumatic systems.
  • Screw Jack Calculation - Power

    Screw Jack Calculation - Power

    Kelston has created an online System Builder for customers to quickly and easily determine an appropriate screw jack system.
  • Screw Jack Working Principle

    Screw Jack Working Principle

    Screw Jacks are found wherever there is a need to lift, position and hold load. A Screw Jack (also known as a Jack Screw, a Worm Screw Jack, a Machine Screw Jack or a Lead Screw Jack) is a devise used to convert rotational motion into linear motion.
  • Worm and Wheel

    Worm and Wheel

    Worm Drives are used when the axis of rotation of a shaft must change direction. Being low-cost, potentially self-locking and providing high gear reductions, Worm Drives provide an effective means of decreasing speed whilst increasing torque.
  • Bevel Gear Sets

    Bevel Gear Sets

    Bevel gears are used when the axis of rotation of a shaft must change direction. Providing a highly efficient and durable means of gear reduction, Bevel Gear sets have many uses.
  • Screw Threads & Mechanical Advantage

    Screw Threads & Mechanical Advantage

    A screw is a mechanical system that converts rotational motion in to linear motion. In other worlds it converts rotational force (torque ) in to a linear force. Here the resultant axial force due to an input torque is calculated from first principles.
  • Screw Thread Terminology

    Screw Thread Terminology

    A screw thread is a helical groove formed on an internal or external diametrical surface and is described by various terms including pitch, root, crest, flank and major diameter. These terms are described here.

Specialising in screw jacks and custom-purpose linear actuators, Kelston Actuation's legacy of precision manufacturing stretches back more than 40 years


Tel.: +44 (0) 117 947 3100

Mon to Thu 07:30 - 17:00
Fri 07:30 - 16:00

COMPANY ADDRESS Kelston Actuation
Limited Unit 2, Unicorn Business Park
Whitby Road, Brislington, Bristol, BS4 4EX

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