rotating screw jack

Rotating Screw Jack: Understanding the Working Principle and Benefits

Rotating screw jack is a highly versatile mechanical device used in various industrial applications to attain linear motion or lift loads. In this article, we’ll explain the fundamental working principle of screw jack, its applications, and advantages, and how to choose the right screw jack for your needs.

What is a Screw Jack Used For?

Screw jacks are widely used in various industries for many applications, such as:

  • Lifting heavy loads, such as machinery, platforms, and vehicles
  • Adjusting the height and position of equipment, workstations, and assembly lines
  • Moving and positioning heavy loads with precision
  • Applying and maintaining pressure in equipment and machinery

screw jack

What is the Working Principle of Screw Jack?

The working principle of a screw jack is based on the linear motion of a screw shaft, which is rotated by an external power source such as an electric motor or a hand crank. The screw shaft is threaded with a lead screw, which moves a load up or down as it rotates. The load is supported by a traveling nut, which moves along the screw shaft in response to the rotation of the lead screw.

screw jack

The screw jack works on the principle of the law of the screw. The load capacity of a screw jack is determined by the diameter of the screw shaft, the pitch of the lead screw, and the efficiency of the screw jack. The efficiency of the screw jack is determined by the coefficient of friction between the screw shaft and the traveling nut, as well as the mechanical losses due to the weight and friction of the screw jack components.

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

The primary difference between a screw jack and a hydraulic jack is the method of force transmission. A screw jack uses mechanical force to lift a load, while a hydraulic jack uses hydraulic fluid pressure to lift a load. Screw jacks have a lower lifting capacity and slower lifting speed than hydraulic jacks, but they are more precise, reliable, and easier to maintain. Screw jacks are also more suitable for applications where the load must be held in a fixed position for an extended period.

How to Select or Customize the Right Screw Jack?

Choosing the right screw jack depends on various factors, such as the load capacity, lifting height, lifting speed, duty cycle, environmental conditions, and safety requirements. Here are some essential parameters to consider:

  • Load capacity: The maximum weight the screw jack can lift
  • Lifting height: The maximum distance the screw jack can move the load vertically
  • Lifting speed: The rate at which the screw jack moves the load vertically
  • Duty cycle: The percentage of time the screw jack is in operation
  • Environmental conditions: The temperature, humidity, and corrosiveness of the operating environment
  • Safety requirements: The need for fail-safe mechanisms, overload protection, and emergency stop controls

screw jack

Why Choose HZPT Screw Jack?

HZPT is a leading manufacturer of industrial motors, gearboxes, and drive systems, including screw jacks. Our products are designed and engineered to provide reliable, efficient, and cost-effective solutions for your motion control needs. Here are some of the advantages of choosing our screw jack:

  • High load capacity: Our screw jacks can lift loads up to 100 tons
  • Low backlash: Our screw jacks have minimal play or slop in the mechanism for precise positioning
  • Wide range of lifting speed and stroke: Our screw jacks can lift loads at speeds from 1 mm/min to 1 m/min, and stroke lengths up to 6 meters
  • Low maintenance: Our screw jacks are designed for long-term operation with minimal maintenance
  • Customizable: Our screw jacks can be tailored to your specific requirements, such as load capacity, lifting height, and environmental conditions

Contact us today to learn more about our screw jacks and how they can benefit your operation.

screw jack


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Ep Screw Jack Co., Ltd.

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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.