12 screw jacks

12 Screw Jacks

In this blog post, we will explore the fascinating world of screw jacks. These mechanical devices have been used for centuries to lift heavy loads and provide precise positioning in various industries. Let’s dive into the details and discover the key features and applications of screw jacks.

1. Introduction to Screw Jacks

A screw jack, also known as a worm gear screw jack, is a mechanical device that converts rotational motion into linear motion. It consists of a worm gear (screw) and a worm wheel (jack), which work together to lift or lower heavy loads with high accuracy and stability.

2. The Components of a Screw Jack

Each screw jack is composed of several essential components:

  • Lead Screw: The lead screw is the main threaded rod that moves up and down when the worm gear is rotated.
  • Worm Gear: The worm gear is a cylindrical screw that engages with the lead screw and converts rotary motion into linear motion.
  • Worm Wheel: The worm wheel is the cylindrical gear that meshes with the worm gear and transfers the rotational motion to the lead screw.
  • Housing: The housing encloses the internal components of the screw jack and provides support and protection.
  • End Fittings: The end fittings are the attachments at the top and bottom of the screw jack, allowing for easy connection to other equipment or structures.

3. What is a Screw Jack Used For?

Screw jacks are widely used in various industrial applications due to their exceptional lifting capabilities and precise positioning. Here are some common uses:

  1. Industrial Machinery: Screw jacks are employed in heavy machinery, such as presses, injection molding machines, and assembly lines, to lift and adjust components.
  2. Construction: Screw jacks help in the leveling of structures, raising beams, and supporting heavy loads during construction projects.
  3. Stage and Theater: In the entertainment industry, screw jacks are used to move platforms, scenery, and lighting equipment.
  4. Automotive: Screw jacks find application in car lifts, vehicle maintenance, and positioning of automotive components.
  5. Medical Equipment: Screw jacks assist in the precise positioning of medical devices, such as operating tables and radiology equipment.

screw jack

4. The Working Principle of Screw Jacks

The working principle of a screw jack revolves around the concept of a helical screw and a corresponding handwheel or motor. When the handwheel or motor rotates the worm gear, it causes the lead screw to move in a linear direction. This linear motion enables the lifting or lowering of heavy loads with precision and control.

The efficiency of a screw jack is determined by the thread size, pitch, and mechanical advantage. The high friction between the screw and the nut ensures stability and prevents backdriving, making screw jacks ideal for load-bearing applications.

screw jack

5. The Difference Between a Screw Jack and a Hydraulic Jack

While both screw jacks and hydraulic jacks are used for lifting heavy loads, they operate on different principles:

  • Power Source: Screw jacks use mechanical power, typically from handwheels or electric motors, while hydraulic jacks rely on hydraulic fluid pressure.
  • Control: Screw jacks provide better control and precision in load positioning, whereas hydraulic jacks offer quick and powerful lifting.
  • Maintenance: Screw jacks require less maintenance and are less prone to leaks compared to hydraulic jacks.
  • Load Capacity: Screw jacks can handle heavier loads, making them suitable for industrial applications with demanding weight requirements.
  • Cost: Screw jacks are generally more cost-effective in the long run, considering their durability and lower maintenance needs.

6. How to Choose or Customize the Right Screw Jack

When selecting or customizing a screw jack, several parameters and practical considerations should be taken into account:

  • Load Capacity: Determine the maximum weight that the screw jack needs to lift and ensure it has an appropriate load capacity.
  • Travel Length: Consider the required vertical displacement or travel length of the screw jack to meet the application’s needs.
  • Speed: Evaluate the desired lifting speed and select a screw jack with the appropriate gear ratio to achieve the desired velocity.
  • Mounting Options: Check the available mounting options, such as flange, base, or top plate, and choose the one that suits your installation requirements.
  • Environment: Assess the operating environment conditions, including temperature, humidity, and potential exposure to corrosive substances, to select a screw jack with suitable protective measures.

screw jack

As a leading manufacturer of industrial motors, gearboxes, and drives in China, HZPT is committed to providing innovative technologies and excellent quality. Our range of products includes micro gear motors, medium-sized gear motors, brake adjustable-speed motors, torque motors, DC motors, NMRV worm gear reducers, bevel gear reducers, WPRV worm gear reducers, rigid tooth face bevel gear reducers, helical worm gear reducers, parallel shaft helical gear reducers, spiral bevel gear reducers, worm screw lifts, rigid tooth surface gear reducers, and planetary gear reducers.

These transmission products find extensive applications in various industries, including transportation machinery, food machinery, medical machinery, printing machinery, textile machinery, packaging machinery, office equipment, and instruments. HZPT products are the preferred choice for automation equipment.

Here are five reasons why you should choose our screw jacks:

  1. High Load Capacity: Our screw jacks are designed to handle heavy loads with ease, ensuring reliable and stable performance.
  2. Precision Positioning: With precise manufacturing and advanced technology, our screw jacks provide accurate positioning for your specific requirements.
  3. Durability: Built with high-quality materials and precision engineering, our screw jacks are durable and suitable for demanding industrial environments.
  4. Customization Options: We offer a wide range of customization options to tailor the screw jack to your unique needs, including load capacity, travel length, and mounting options.
  5. Expertise and Support: With years of experience in the industry, our team of experts is ready to provide professional advice and support to help you find the perfect screw jack solution.

Partner with HZPT for your screw jack needs and experience the benefits of our high-quality products and exceptional customer service.


Find us

Ep Screw Jack Co., Ltd.

Mail: [email protected]

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.