translating screw jack




Translating Screw Jack

Translating Screw Jack

A screw jack, also known as a worm drive jack, is a mechanical device that converts rotary motion into linear motion. It is commonly used in various applications where heavy loads need to be lifted, lowered, positioned, or clamped. In this article, we will discuss the working principle of screw jack, its applications, differences from hydraulic jack, and how to select or customize the right screw jack for your needs.

What is a Screw Jack Used For?

Screw jacks are used in a variety of applications, including:

  • Industrial Machinery: Screw jacks are used in industrial machinery for lifting, lowering, positioning, and clamping heavy loads. They are commonly used in assembly lines, material handling equipment, and other manufacturing processes.
  • Construction: Screw jacks are used in construction for supporting structures, such as bridges, buildings, and towers. They are also used for lifting heavy equipment and materials.
  • Automotive: Screw jacks are used in automotive applications for lifting vehicles, such as cars and trucks. They are commonly used in garages, repair shops, and auto manufacturing plants.
  • Aviation and Aerospace: Screw jacks are used in aviation and aerospace applications for raising and lowering equipment and vehicles, such as aircraft and spacecraft. They are commonly used in maintenance and repair operations.
  • Medical: Screw jacks are used in medical applications for lifting and positioning patients and equipment. They are commonly used in hospitals, clinics, and rehabilitation facilities.

screw jack

What is the Working Principle of Screw Jack?

The working principle of a screw jack is based on the mechanical advantage of a worm drive. When a rotary motion is applied to the worm gear, it rotates the screw, which moves the load up or down depending on the direction of rotation. The force required to lift the load is much less than the force applied to the worm gear due to the high mechanical advantage of the screw jack.

The efficiency of a screw jack depends on several factors, including the pitch of the screw, the lead angle of the worm, the coefficient of friction, and the thread radius. These factors determine the amount of force and speed that can be transmitted by the screw jack.

screw jack

What is the Difference Between a Screw Jack and a Hydraulic Jack?

The main difference between a screw jack and a hydraulic jack is the way they transmit force. A screw jack uses mechanical advantage to lift or lower a load, while a hydraulic jack uses the pressure of a fluid to do the same. Hydraulic jacks are more suitable for applications where high force and speed are required, while screw jacks are more suitable for applications where precision and stability are required.

In addition, hydraulic jacks require a hydraulic power source, which can be more complex and costly than the mechanical components of a screw jack. Screw jacks are also more durable and require less maintenance than hydraulic jacks.

How to Select or Customize the Right Screw Jack?

When selecting or customizing a screw jack, several factors need to be considered:

  • Load Capacity: The load capacity of a screw jack depends on the size of the screw, the material of the screw and housing, and the number and size of the load-bearing surfaces.
  • Lifting Height: The lifting height of a screw jack depends on the pitch of the screw and the number of threads. Longer screws and more threads result in higher lifting heights.
  • Lifting Speed: The lifting speed of a screw jack depends on the rotational speed of the worm gear and the pitch of the screw. Higher rotational speeds and steeper pitches result in faster lifting speeds.
  • Environmental Conditions: The environmental conditions, such as temperature, humidity, and corrosive agents, may affect the performance and lifespan of a screw jack. Special coatings, materials, or lubricants may be required to withstand these conditions.
  • Mounting Options: The mounting options of a screw jack depend on the type and location of the load, the space available for mounting, and the required stability and precision. Different types of mounts, such as flange, foot, or trunnion mounts, may be available.

screw jack

Why Choose HZPT Screw Jack?

As a leading manufacturer and supplier of industrial motors, gearboxes, and drives, HZPT offers a wide range of high-quality screw jacks that meet the needs of various industries. Our screw jacks are designed and manufactured to the highest standards of quality and reliability, ensuring long-lasting performance and low maintenance costs.

Here are some of the advantages of choosing HZPT screw jacks:

  • Customization: We offer customized solutions to meet unique requirements and specifications. Our engineering team works closely with customers to design and produce the most suitable screw jack for their applications.
  • Wide Range of Load Capacities: Our screw jacks are available in a wide range of load capacities, from a few pounds to several tons, to meet different lifting and positioning needs.
  • High Lifting Height: Our screw jacks can achieve high lifting heights, up to several meters, depending on the specific screw and gear ratios used.
  • Smooth and Precise Operation: Our screw jacks offer smooth and precise operation, with low noise and vibration levels, thanks to the high-quality materials and manufacturing processes used.
  • Durable and Reliable: Our screw jacks are designed and tested to withstand harsh environmental conditions, heavy loads, and frequent use, ensuring long service life and low maintenance costs.

Contact us now to learn more about our screw jacks and how they can improve your operations!


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As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.