pfaff screw jacks

PFaff Screw Jack

Pfaff Screw Jack

Screw jacks are widely used in the industrial sector as a simple and efficient way to lift, lower, position and support heavy loads. Pfaff is a leading manufacturer of screw jacks and provides a wide range of high-quality products for various applications. In this article, we will introduce the basics of screw jacks, their working principle, differences from hydraulic jacks and how to choose or customize the right screw jack for your needs. We will also recommend HZPT, the leading manufacturer of screw jacks in China, and why you should choose our products and services.

What is a screw jack?

A screw jack, also known as a worm gear screw jack or a mechanical jack, is a device used to lift heavy loads vertically or horizontally. It consists of a lifting screw, a worm gear reducer and a handwheel or motor for rotation. The lifting screw is threaded through the worm gear reducer, which converts rotational motion into linear motion. When the screw rotates, it moves up or down, depending on the direction of rotation. The screw jack can be used alone or in multiple units to achieve higher lifting loads.

What is a screw jack used for?

Screw jacks are commonly used in various applications, such as:

  • Heavy machinery: Screw jacks can be used to lift, lower and position heavy machinery, such as presses, molding machines, and printing presses.
  • Construction: Screw jacks can be used for temporary support of structures during construction or repair work.
  • Stage and theater: Screw jacks can be used for raising and lowering stages, backdrops and lighting equipment in theaters.
  • Transportation: Screw jacks can be used as stabilizers for trailers and caravans during loading and unloading.
  • Automation: Screw jacks can be used as linear actuators for various automation applications, such as adjusting conveyor belts, valves or gates.

screw jack

What is the working principle of screw jack?

The working principle of a screw jack is based on the mechanical advantage of the worm gear reducer. When the handle or motor rotates the worm gear, it drives the lifting screw to move up or down. The linear motion of the screw is transformed into a larger rotational motion of the worm gear, which provides a mechanical advantage to lift heavy loads with minimal force. The efficiency of a screw jack depends on the lead angle of the screw, the pitch of the thread and the friction of the components.

screw jack

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

Compared to hydraulic jacks, screw jacks have the following advantages:

  • Precise control: Screw jacks can provide precise and steady lifting motion with minimal backlash and self-locking ability.
  • Less maintenance: Screw jacks require less maintenance than hydraulic jacks, as they do not require fluid changes or hydraulic seals.
  • Environmentally friendly: Screw jacks do not require hydraulic fluid, which eliminates the risk of leakage and contamination.
  • Lower cost: Screw jacks are generally less expensive than hydraulic jacks, especially for small to medium loads.
  • Limited self-protection: Screw jacks have a limited self-protection ability and can be damaged if overloaded or misused.

How to choose or customize the right screw jack?

When selecting or customizing a screw jack, it is important to consider the following parameters and real-world conditions:

  • Load capacity: Determine the maximum weight of the load to be lifted, as well as the safety factor required.
  • Lifting height: Calculate the required lifting height and the number of screw jack units needed.
  • Lifting speed: Evaluate the desired lifting speed and the available power source, such as handwheel, motor or gearbox.
  • Environment: Consider the operating conditions, such as temperature, humidity, dust or corrosion resistance.
  • Mounting: Determine the mounting arrangements, such as base, flange or clevis, and the required accessories, such as couplings or limit switches.

screw jack

Why choose HZPT screw jacks?

HZPT is a leading manufacturer of screw jacks in China, and we offer a comprehensive range of high-quality products and services for your needs. Our advantages include:

  1. Rich experience: With over 20 years of experience in the industry, we have accumulated extensive knowledge and expertise to provide reliable and efficient solutions.
  2. Advanced technology: We adopt the latest technology and equipment to ensure the precision, durability and safety of our products, such as CNC machining, heat treatment and testing.
  3. Customization: We can customize the screw jack according to your specific requirements, such as load capacity, lifting height, lifting speed, mounting, and accessories.
  4. Competitive price: We offer competitive prices for our products and services, without compromising on quality or performance.
  5. Excellent service: We provide comprehensive pre-sales, in-sales and after-sales services, such as technical consultation, installation guidance, maintenance support, and warranty.

If you want to know more about our products and services, please contact us at [email protected] or visit our website at We look forward to working with you and providing the best solutions for your lifting needs.


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.