scissor jack screw

Scissor Jack Screw: A Comprehensive Guide

A scissor jack screw is a type of mechanical jack designed to lift heavy objects, such as cars, trucks, and trailers. It consists of a threaded screw shaft and a set of connecting rods that expand and contract in a scissor-like motion, providing a stable lifting platform. In this article, we will explore the different aspects of scissor jack screws, including their uses, working principle, differences from hydraulic jacks, and how to select or customize the right one for your needs.

What is a Screw Jack Used For?

Scissor jack screws are commonly used for a variety of applications that require heavy lifting, such as:

  • Vehicle repair and maintenance: Scissor jack screws are widely used in automotive repair shops and garages to lift cars, trucks, and trailers for tire changes, oil changes, and other routine maintenance tasks.
  • Construction and industrial operations: Scissor jack screws can be used to lift and support heavy equipment, machinery, and construction materials, such as steel beams and concrete blocks.
  • Medical and rehabilitation equipment: Scissor jack screws are used in medical and rehabilitation equipment, such as hospital beds and patient lifts, to adjust the height and position of the equipment to the patient’s needs.
  • Stage and theater equipment: Scissor jack screws are used in stage and theater equipment, such as lighting rigs and speaker systems, to adjust the height and position of the equipment for optimal performance.
  • Warehouse operations: Scissor jack screws are commonly used in warehouse operations to lift and move heavy pallets and containers, as well as to adjust the height of storage racks and shelves.

screw jack

What is the Working Principle of Screw Jack?

The working principle of a scissor jack screw is based on the screw theory. When the screw shaft is rotated, the connecting rods, which are attached to the top and bottom of the screw shaft, move in opposite directions, causing the scissor arms to expand or contract. As the scissor arms expand, the lifting platform moves upward, while as they contract, the lifting platform moves downward. The rotation of the screw shaft is typically achieved by a hand crank or an electric motor, depending on the application.

Scissor jack screws are designed to provide a mechanical advantage, meaning that the force applied to the hand crank or motor is multiplied to lift heavier loads than would be possible manually. The mechanical advantage is determined by the pitch of the screw thread, which is the distance between two consecutive threads on the screw shaft. The greater the pitch, the higher the mechanical advantage, and the easier it is to lift heavy loads.

screw jack

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 operation. A screw jack relies on mechanical force to lift heavy loads, while a hydraulic jack uses hydraulic pressure to lift heavy loads. Hydraulic jacks are typically faster and more powerful than screw jacks, but they are also more complex and require more maintenance. In addition, hydraulic jacks are more expensive than screw jacks and may require special tools and expertise to repair and maintain.

How to Choose or Customize the Right Screw Jack?

Choosing or customizing the right screw jack depends on several factors, including:

  • Load capacity: The load capacity of a screw jack should be sufficient to lift the weight of the object to be lifted, plus any additional weight due to friction or acceleration.
  • Lifting height: The lifting height of a screw jack should be sufficient to raise the object to the desired height, while still providing enough clearance for the object to be lifted.
  • Operating speed: The operating speed of a screw jack should be appropriate for the application, taking into account factors such as safety, efficiency, and precision.
  • Environmental conditions: The environmental conditions, such as temperature, humidity, and corrosive agents, may affect the performance and longevity of a screw jack and should be taken into consideration when selecting or customizing one.
  • Mounting options: The mounting options for a screw jack should be appropriate for the application, taking into account factors such as space constraints, accessibility, and stability.

screw jack


As a leading manufacturer of industrial motors, gearboxes, and drives in China, HZPT offers a wide range of screw jacks that are designed to meet the rigorous demands of various industries. Our screw jacks are engineered to provide superior lifting performance, reliability, and safety, and are backed by a team of experienced engineers and technicians who are dedicated to ensuring optimal performance and customer satisfaction.

Here are some advantages of our screw jacks:

  • High load capacity: Our screw jacks are designed to lift heavy loads with ease, thanks to their robust construction and advanced engineering.
  • Wide range of lifting heights: Our screw jacks offer a wide range of lifting heights, from a few inches to several feet, to meet the unique needs of different applications.
  • Smooth and efficient operation: Our screw jacks are designed to operate smoothly and efficiently, with minimal noise and vibration, for maximum productivity and safety.
  • Customizable options: We offer a range of customizable options, such as different sizes, materials, and mounting options, to meet the specific needs of our customers.
  • Competitive pricing and fast delivery: We offer competitive pricing and fast delivery times, to ensure that our customers get the best value and service for their investment.

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.