screw jack with dimensions

Screw Jack with Dimensions

A screw jack is a mechanical device that converts rotary motion into linear motion by means of a screw and nut. It is used to lift or lower heavy loads, apply pressure, or support structures. In this article, we’ll discuss the dimensions of a screw jack, its applications, working principle, differences with hydraulic jacks, 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:

  • Heavy machinery lifting
  • Pressing and shaping materials
  • Adjusting workpiece alignment and height
  • Stabilizing structures or equipment
  • Opening and closing valves and gates

screw jack

As shown in the image, screw jacks are commonly used in the automotive and construction industries, as well as in manufacturing plants, warehouses, and shipyards. They offer a simple, reliable, and cost-effective way to lift or support heavy loads without the need for hydraulic or electrical power.

What is the Working Principle of Screw Jack?

The working principle of a screw jack is based on the law of the screw, which states that a small force applied over a long distance can produce a large force over a short distance. In a screw jack, this is achieved by rotating a screw (the input) that engages with a nut (the output). As the screw rotates, it moves the nut along the screw’s axis, which translates into linear motion. The pitch of the screw and the number of threads determine the linear displacement per revolution, which affects the speed and lifting capacity of the screw jack.

screw jack

As shown in the image, the screw and nut can have different shapes and profiles, such as square, trapezoidal, or ball, depending on the application requirements. The screw jack can also have multiple screws and nuts, arranged in series or parallel, to increase the lifting capacity or stability. The screw jack can be operated manually, by using a crank or a lever, or powered, by using an electric or pneumatic motor.

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 uses mechanical power, while a hydraulic jack uses fluid power.
  • Speed: A screw jack is slower than a hydraulic jack, as it requires more revolutions to achieve the same linear motion.
  • Accuracy: A screw jack is more accurate than a hydraulic jack, as it can maintain the position and load without pressure fluctuations or leaks.
  • Maintenance: A screw jack requires less maintenance than a hydraulic jack, as it has fewer moving parts and does not need hydraulic fluid or filters.
  • Cost: A screw jack is usually cheaper than a hydraulic jack, as it does not require hydraulic pumps, hoses, valves, and cylinders.

How to Choose or Customize the Right Screw Jack?

When choosing or customizing a screw jack, you should consider the following parameters:

  • Lifting capacity: The maximum load that the screw jack can lift or support, which depends on the screw diameter, pitch, and material, as well as the nut type and material.
  • Stroke length: The range of linear motion that the screw jack can produce, which depends on the screw length, number of threads, and end conditions.
  • Speed: The rate of linear motion that the screw jack can achieve, which depends on the screw pitch and nut efficiency, as well as the input torque and speed.
  • Accuracy: The precision of position control that the screw jack can provide, which depends on the screw thread quality, the nut backlash, and the input torque resolution.
  • Environment: The operating conditions that the screw jack will be exposed to, such as temperature, humidity, vibration, corrosion, and shock.

screw jack

Based on these parameters, you can select or customize the screw jack that best suits your application needs, by choosing the appropriate screw diameter, pitch, length, thread type, nut type, material, and coating. You can also add accessories such as protective boots, limit switches, encoders, couplings, and mounting brackets, to enhance the screw jack’s performance and safety.

Why Choose HZPT Screw Jacks?

HZPT is a leading manufacturer and supplier of screw jacks, with years of experience and expertise in the field. Our screw jacks are designed and manufactured to the highest standards of quality, reliability, and safety, and can be customized to meet your specific needs and requirements.

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

  • Wide range of sizes, capacities, and configurations
  • Highly efficient and low-friction screw and nut designs
  • Durable and corrosion-resistant materials and coatings
  • Precision machining and assembly for optimal performance
  • Easy installation, operation, and maintenance
  • Competitive prices and fast delivery

Whether you need a screw jack for lifting heavy machinery, adjusting workpiece height, or stabilizing structures, HZPT has the right solution for you. Contact us today to learn more about our screw jacks and how we can help you improve your productivity and efficiency.


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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.