jack screw assembly

Jack Screw Assembly: What You Need to Know

Jack screw assembly is an essential part of many industrial applications. In this article, we will explore the details of jack screw assembly, its working principle, and how it differs from other types of jacks. We will also provide information on how to choose or customize a suitable screw jack and introduce HZPT, a leading manufacturer of industrial motors, reducers, and drives.

What is a Screw Jack Used For?

screw jack

Screw jacks are used to lift heavy loads vertically or move them horizontally. They are widely used in various industries, such as transportation machinery, food machinery, medical machinery, printing machinery, textile machinery, packaging machinery, office equipment, and instruments.

Here are some of the main applications of screw jacks:

  • Adjusting the height of workbenches, tables, and platforms
  • Positioning solar panels, satellites, and telescopes
  • Operating valves, dampers, and gates
  • Stabilizing and leveling heavy equipment and machinery
  • Controlling the tension and compression of structures and materials

What is the Working Principle of Screw Jack?

screw jack

The working principle of a screw jack is based on the mechanical advantage of a screw thread. A screw thread converts rotary motion into linear motion and multiplies the force applied to it. When a force is applied to the handle of a screw jack, the screw thread rotates, and the screw nut moves along the screw shaft. As the screw nut moves, it raises or lowers the load attached to it.

The main components of a screw jack are:

  • A screw shaft with a thread profile
  • A screw nut with matching threads
  • A worm gear or bevel gear set to rotate the screw shaft
  • A housing to support the screw shaft and nut
  • A lifting mechanism to attach the load to the screw nut

The efficiency of a screw jack depends on the lead angle, pitch, and diameter of the screw thread, as well as the friction between the threads and the lubrication used. The load capacity of a screw jack depends on the diameter, length, and material of the screw shaft, nut, and housing, as well as the type and number of load attachments.

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 method of force transmission. A screw jack uses a screw thread to convert rotary motion into linear motion, while a hydraulic jack uses a hydraulic fluid to transmit pressure and force.

Here are some of the pros and cons of screw jacks and hydraulic jacks:

Screw Jack Hydraulic Jack
Advantages Simple design, easy maintenance, precise positioning, no leakage, low environmental impact High force output, rapid movement, remote control, smooth operation, suitable for confined spaces
Disadvantages Low speed, low efficiency, high backdriving, limited stroke length, high noise Complex design, high maintenance, potential leakage, environmental concerns, fire hazard

How to Choose or Customize a Suitable Screw Jack?

screw jack

Choosing or customizing a suitable screw jack depends on various factors, such as the load capacity, speed, stroke, accuracy, environment, power source, and budget. Here are some of the parameters and conditions to consider:

  • Load capacity: Determine the weight and dimensions of the load to be lifted or moved, and select a screw jack with a suitable load rating and safety factor.
  • Speed: Determine the required lifting or moving speed, and select a screw jack with a suitable gear ratio and screw pitch.
  • Stroke: Determine the required lifting or moving distance, and select a screw jack with a suitable screw length and stroke limit.
  • Accuracy: Determine the required positioning or leveling accuracy, and select a screw jack with a suitable lead accuracy and backlash.
  • Environment: Determine the operating temperature, humidity, and exposure to dust, water, chemicals, or radiation, and select a screw jack with suitable seals, coatings, and materials.
  • Power source: Determine the available power source, such as electric, manual, or pneumatic, and select a screw jack with a suitable motor or handle.
  • Budget: Determine the available budget, and select a screw jack with a suitable price and performance ratio, or customize a screw jack with a suitable design and manufacturing process.

Why Choose HZPT’s Screw Jack?

HZPT is a professional manufacturer and supplier of screw jacks with over 15 years of experience. Our screw jacks are designed and manufactured to meet various industrial requirements and standards, such as ISO, DIN, JIS, and ANSI. Here are some of the advantages of our screw jacks:

  • Wide range of load ratings from 1 ton to 120 tons
  • High gear ratios from 5:1 to 100:1
  • High lead accuracies from 0.05 mm to 0.2 mm
  • High efficiency up to 0.9
  • High reliability with overload protection, self-locking, and anti-backdriving features
  • High adaptability to various environments with IP65 or IP66 protection, anti-corrosion coating, and high-temperature resistance
  • High customization with various options of motor, encoder, brake, limit switch, and coupling
  • High value with competitive prices and long service life

Contact us now to learn more about our screw jacks and how we can help you with your industrial applications!


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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.