screw jack handle

screw jack handle

What is a screw jack used for?

A screw jack is a mechanical device used to lift heavy loads or apply a large force through a linear motion. It is commonly used in various industries such as construction, automotive, and manufacturing. The main purpose of a screw jack is to provide a stable and reliable method for raising or lowering objects, supporting structures, or applying pressure.

Industrial Applications

Screw jacks are widely used in industrial applications such as assembly lines, machinery positioning, and material handling. They can be found in industries like transportation, food processing, medical equipment manufacturing, printing, textile, packaging, and office equipment.

Construction and Engineering

In construction and engineering projects, screw jacks are used for tasks such as supporting structures, adjusting heights, and leveling surfaces. They are essential in providing stability and precision during the construction process.

Vehicle Maintenance

Screw jacks are also commonly used in automotive workshops and garages for lifting vehicles during maintenance or repair work. They provide a safe and efficient way to raise the vehicle to a suitable height, allowing mechanics easier access to perform their tasks.

Stage and Theater

In the entertainment industry, screw jacks are utilized for stage setups and theater productions. They are employed to lift and position heavy scenery, lighting rigs, and other equipment, ensuring smooth and precise movements during performances.

Heavy Machinery

Screw jacks are an integral part of heavy machinery systems that require precise positioning and stability. They are used in machinery such as presses, injection molding machines, and metalworking equipment to apply controlled force and movement.

screw jack

What is the working principle of screw jack?

The working principle of a screw jack involves converting rotational motion into linear motion using a screw and a nut. When the handle or motor rotates the screw, it moves through the threaded nut, resulting in the linear displacement of the load being lifted or lowered. The thread pitch determines the amount of linear motion achieved per revolution of the screw.

Rotational Input

The screw jack receives rotational input from a handle, motor, or other power source. This rotational motion is transferred to the screw, causing it to rotate.

Threaded Screw and Nut

The screw and nut have mating threads that allow them to engage with each other. As the screw rotates, it moves linearly through the nut, either raising or lowering the load.

Worm Gear Mechanism

Some screw jacks employ a worm gear mechanism, which consists of a worm screw and a worm wheel. The worm screw provides the rotational input, while the worm wheel translates this motion into linear displacement.

Self-Locking Mechanism

Most screw jacks feature a self-locking mechanism, which prevents the load from descending when the rotational force is removed. This enhances safety and stability by maintaining the load position.

screw jack

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

While both screw jacks and hydraulic jacks are used for lifting heavy loads, they operate on different principles and offer distinct advantages.

Operating Principle

Screw jacks use mechanical motion and the rotation of a screw to achieve linear displacement, while hydraulic jacks rely on fluid pressure to generate force and movement.

Load Capacity

Screw jacks are typically designed for lower load capacities compared to hydraulic jacks. Screw jacks are more suitable for applications that involve precise positioning and moderate loads, while hydraulic jacks are capable of lifting heavier loads.

Speed and Efficiency

Hydraulic jacks are generally faster and more efficient in terms of lifting speed compared to screw jacks. The hydraulic system can provide rapid and continuous lifting, making it ideal for applications that require quick positioning.

Compactness and Portability

Screw jacks are often more compact and portable than hydraulic jacks. They are easier to handle and transport, which can be advantageous in certain situations where space is limited or frequent relocation is necessary.

Control and Adjustability

Screw jacks offer precise control and adjustability due to their threaded screw design. They allow for finer adjustments and have a higher degree of repeatability, making them suitable for tasks that require accuracy and stability.

screw jack

How to choose or customize the appropriate screw jack?

When selecting or customizing a screw jack, several parameters and practical considerations should be taken into account:

Load Capacity and Application

Determine the maximum load that the screw jack needs to lift or support. Consider the specific application requirements, such as the weight distribution, required speed, and operational environment.

Travel Length

Measure the required travel length or stroke of the screw jack to ensure it can meet the desired range of motion.

Lifting Speed

Assess the necessary lifting speed for the application. Depending on the requirements, choose a screw jack with a suitable gear ratio or consider additional accessories like electric motors or gear reducers.

Mounting and Integration

Consider the available space and mounting options for the screw jack. Evaluate whether the screw jack needs to be integrated into an existing system or if additional mounting accessories are required.

Environmental Factors

Take into account the operating environment, including temperature, humidity, and exposure to dust, chemicals, or other potentially corrosive substances. Select a screw jack with appropriate materials and coatings to ensure durability and longevity.

screw jack

As a leading manufacturer of industrial motors, gearboxes, and drive solutions in China, HZPT adheres to the philosophy of “leading technological innovation, achieving excellent quality.” Our main products include micro gear motors, medium-sized gear motors, brake adjustable-speed motors, torque motors, DC motors, NMRV worm gear motors, bevel gear motors, WPRV worm gear reducers, rigid face gear reducers, bevel gear screw jack reducers, parallel-axis bevel gear reducers, spiral bevel gear reducers, worm gear screw lifts, rigid face gear reducers, and planetary gear reducers. These transmission products are extensively used in various industrial production lines, including transportation machinery, food machinery, medical machinery, printing machinery, textile machinery, packaging machinery, office equipment, and instruments.

We specialize in the production and sale of screw jacks, offering the following advantages:

Quality and Reliability

Our screw jacks are manufactured to the highest quality standards, ensuring reliability and long-lasting performance. We use premium materials and employ strict quality control measures throughout the production process.

Customization Options

We provide customization services to meet specific customer requirements. Our experienced engineers can design and manufacture screw jacks tailored to individual needs, including load capacity, travel length, lifting speed, and mounting options.

Technical Expertise

With years of experience in the industry, our team of technical experts possesses extensive knowledge and expertise in screw jack technology. We can offer professional guidance, technical support, and assistance in selecting the most suitable screw jack for your application.

Competitive Pricing

We strive to provide cost-effective solutions without compromising on quality. Our competitive pricing ensures that customers receive excellent value for their investment in our screw jacks.

Timely Delivery

We understand the importance of timely delivery. Our efficient production processes and streamlined logistics enable us to meet delivery deadlines and ensure customer satisfaction.

Contact us now to discuss your screw jack requirements and discover how our products and expertise can benefit your business.


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.