metric jack screw

Metric Jack Screw: An In-Depth Exploration


The metric jack screw is a versatile mechanical device that plays a significant role in various industries. With its unique design and functionality, it offers precise control and efficient power transmission. In this blog post, we will delve into the intricacies of the metric jack screw, exploring its applications, working principle, differences from hydraulic jacks, and how to select or customize the right screw jack for your specific needs.

screw jack

What is a Screw Jack Used For?

The applications of a screw jack are diverse and extensive. Let’s explore some of the key uses:

  1. Lifting Heavy Loads: One of the primary purposes of a screw jack is to lift heavy loads vertically or at an inclined angle. Its sturdy construction and high load-bearing capacity make it ideal for tasks such as lifting machinery, platforms, and structures.
  2. Precision Positioning: The screw jack’s fine thread pitch allows for precise positioning of objects. This makes it valuable in applications that require accurate height adjustments or alignment, such as assembly lines, stage setups, and precision machinery.
  3. Load Holding: Screw jacks can also function as reliable load-holding devices. They can securely hold heavy loads in position without the need for continuous power supply, making them suitable for scenarios where stability and safety are paramount.
  4. Adjusting Mechanical Components: Another common use of screw jacks is in adjusting mechanical components, such as tensioning belts, aligning shafts, or fine-tuning equipment settings. The screw jack’s threaded shaft allows for easy and controlled adjustments.
  5. Actuating Mechanisms: Screw jacks can be utilized as actuators in various systems, such as opening or closing valves, adjusting dampers, or controlling the flow of fluids. Their mechanical advantage and precise control contribute to efficient operation.

screw jack

What is the Working Principle of Screw Jack?

To understand the working principle of a screw jack, we need to examine its components and their interactions:

  1. Input Shaft: The input shaft, commonly operated by a hand crank or an electric motor, rotates to provide the driving force.
  2. Worm Gear: Connected to the input shaft, the worm gear consists of a threaded worm and a gear wheel. The rotation of the worm converts the rotary motion into linear motion.
  3. Travelling Nut: The travelling nut moves along the threaded worm, translating the rotational motion into linear motion. It is typically connected to the load or a mechanism that requires movement.
  4. Load: The load refers to the object or system that the screw jack supports or moves. It can range from heavy machinery to structural elements.
  5. Self-Locking Mechanism: Screw jacks often incorporate a self-locking mechanism to prevent the load from descending unintentionally. This enhances safety and stability.

screw jack

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

While both screw jacks and hydraulic jacks serve the purpose of lifting and supporting heavy loads, they differ in their operating principles and characteristics:

  1. Operating Principle: Screw jacks use mechanical advantage and rotation to lift and lower loads, while hydraulic jacks utilize fluid pressure to generate lifting force.
  2. Power Source: Screw jacks are typically manually operated or driven by electric motors, whereas hydraulic jacks require hydraulic fluid and a pumping system to function.
  3. Control and Precision: Screw jacks offer finer control and precise position holding due to their thread pitch, making them suitable for applications that require accurate adjustments. Hydraulic jacks provide a smoother and faster lifting motion.
  4. Load Capacity: Screw jacks generally have higher load capacities compared to hydraulic jacks, making them more suitable for heavy-duty applications.
  5. Maintenance and Durability: Screw jacks are known for their robust construction and require minimal maintenance. Hydraulic jacks, on the other hand, may require regular fluid checks and servicing.

How to Choose or Customize the Right Screw Jack

When selecting or customizing a screw jack, several parameters and practical considerations come into play:

  1. Load Requirements: Determine the maximum load the screw jack needs to handle. Consider both static and dynamic loads.
  2. Travel Distance: Assess the required vertical travel distance or stroke length for your application.
  3. Speed and Efficiency: Evaluate the desired lifting speed and efficiency to ensure optimal performance.
  4. Mounting Options: Consider the available space and mounting requirements to determine the most suitable screw jack configuration, such as upright, inverted, or translating.
  5. Environmental Factors: Take into account the operating environment, including temperature, moisture, dust, and corrosive substances, to select appropriate materials and coatings for enhanced durability.

screw jack

At HZPT, we pride ourselves on being a leading manufacturer and supplier of screw jacks, among other industrial motor, gearbox, and transmission products. Our commitment to technological innovation and excellence in quality sets us apart. Here are some key advantages of our products and company:

  1. Broad Product Range: We offer a wide range of screw jacks, including micro-sized, medium-sized, brake-regulated, torque motors, DC motors, NMRV worm and helical gear motors, WPRV worm gear reducers, rigid face gear reducers, spiral bevel gear reducers, parallel shaft helical gear reducers, and more. Our transmission products cater to diverse industrial sectors, such as transportation, food processing, medical equipment, printing, textile machinery, packaging, and instrumentation.
  2. Customization Options: We understand that each application has unique requirements. That’s why we provide customization services, allowing you to tailor the screw jack to your specific needs, including load capacities, travel distances, speed requirements, and mounting configurations.
  3. Superior Quality: Our products undergo rigorous quality control processes, ensuring reliable performance, durability, and precision. We source high-quality materials and employ advanced manufacturing techniques to deliver products that meet international standards.
  4. Expertise and Support: With years of experience in the industry, our team of experts is ready to provide technical assistance and guidance throughout the product selection and customization process. We are dedicated to helping you find the optimal solution for your application.
  5. Customer Satisfaction: At HZPT, customer satisfaction is our top priority. We strive to build long-term partnerships by delivering exceptional products, responsive customer service, and timely support. Your success is our success.

Choose HZPT as your trusted partner for all your screw jack needs. Contact us today to discuss your requirements and experience the HZPT difference.


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.