car lift screw jack

Screw Jack – The Ultimate Guide

Car Lift Screw Jack


A screw jack, also known as a worm gear jack, is a mechanical device used for lifting heavy loads. It consists of a screw shaft and a worm gear mechanism that converts rotary motion into linear motion. Screw jacks are widely used in various industries for their ability to provide precise and controlled lifting or lowering operations.

What is a screw jack used for?

A screw jack is used for:

  1. Vehicle lifting: Screw jacks are commonly used in car lifts and other automotive service equipment to raise and support vehicles for maintenance or repairs. They provide a stable and secure lifting solution.
  2. Industrial machinery: Screw jacks are employed in heavy machinery, such as presses, injection molding machines, and assembly lines, to adjust the height or position of components during production processes.
  3. Stage and theater equipment: Screw jacks are utilized in stage lifts and theater rigging systems to raise or lower props, scenery, and lighting fixtures, allowing for dynamic and flexible stage setups.
  4. Construction and infrastructure projects: Screw jacks are used in construction projects for temporary lifting or leveling of structures, such as bridges, buildings, and heavy machinery.
  5. Material handling: Screw jacks are employed in material handling equipment, such as conveyors and loading docks, to lift and position goods for efficient transportation and storage.

screw jack

What is the working principle of screw jack?

The working principle of a screw jack is based on the interaction between a screw and a worm gear mechanism. When the worm gear is rotated, it moves the screw shaft either up or down, depending on the direction of rotation. This linear motion allows the screw jack to lift or lower heavy loads in a controlled manner. The high mechanical advantage of the screw thread ensures stability and prevents the load from slipping.

screw jack

What is the difference between a screw jack and a hydraulic jack?

The main differences between a screw jack and a hydraulic jack are:

  • Power source: A screw jack is manually operated or driven by an electric motor, while a hydraulic jack utilizes fluid pressure to exert force.
  • Load capacity: Screw jacks can handle heavy loads, ranging from a few tons to hundreds of tons, whereas hydraulic jacks are generally used for lighter loads.
  • Speed and control: Screw jacks offer precise control over the lifting process and are suitable for slow and controlled movements, while hydraulic jacks can provide faster lifting speeds.
  • Maintenance and reliability: Screw jacks require less maintenance and have a longer lifespan compared to hydraulic jacks, which may require regular fluid changes and seal replacements.
  • Cost: Screw jacks are generally more cost-effective than hydraulic jacks, especially for applications involving heavy loads and lower operating speeds.

How to choose or customize the right screw jack?

Choosing or customizing the right screw jack involves considering several parameters and practical conditions:

  1. Load capacity: Determine the maximum weight the screw jack needs to lift or support.
  2. Lifting height: Calculate the required vertical travel distance for the application.
  3. Lifting speed: Consider the desired speed of the lifting operation, whether it needs to be fast or slow.
  4. Environment: Evaluate the operating environment, including temperature, humidity, and exposure to chemicals or corrosive substances.
  5. Mounting options: Select the suitable mounting configuration, such as upright, inverted, or multi-jack arrangements.

screw jack

About HZPT – Your Trusted Screw Jack Manufacturer

As a leading manufacturer of industrial electric motors, gearboxes, and drive systems in China, HZPT is committed to technological innovation and excellent product quality. We offer a wide range of transmission products, including:

  • Micro gear motors
  • Medium-sized gear motors
  • Brake adjustable-speed motors
  • Torque motors
  • DC motors
  • NMRV worm gear motors
  • Spiral bevel gear motors
  • WPRV worm gear reducers
  • Rigid tooth surface helical gear reducers
  • Helical worm gear reducers
  • Parallel shaft helical gear reducers
  • Screw lift systems
  • Rigid tooth surface gear reducers
  • Planetary gear reducers

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

Why choose HZPT?

  1. Quality assurance: Our products undergo strict quality control measures to ensure superior performance and reliability.
  2. Customization options: We offer customized solutions to meet specific customer requirements and application needs.
  3. Technical expertise: With years of industry experience, our team of experts provides professional technical support and guidance.
  4. Competitive pricing: We strive to offer competitive prices without compromising on product quality.
  5. Customer satisfaction: We prioritize customer satisfaction and aim to establish long-term partnerships based on trust and mutual benefits.


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.