joist jack

joist jack


A joist jack, also known as a screw jack, is a mechanical device used in construction and engineering projects to provide support and lifting capabilities. It consists of a threaded rod or screw mechanism that is driven by a handle or motor, allowing for vertical movement and adjustment.

What is a screw jack used for?

1. Industrial applications: Screw jacks are commonly used in industrial machinery and equipment for lifting heavy loads and providing stability during operation. They are often found in assembly lines, material handling systems, and automation systems.

2. Construction projects: Screw jacks are essential in construction projects for supporting structures, such as beams and joists. They can be used to level and adjust the height of floors, ceilings, and other load-bearing components.

screw jack

3. Maintenance and repair: Screw jacks are also utilized in maintenance and repair work, providing a stable platform for technicians to access hard-to-reach areas or to lift heavy equipment for servicing.

4. Vehicle lifting: Screw jacks are used in automotive garages and workshops for lifting vehicles, allowing mechanics to perform repairs and maintenance underneath the car.

5. Stage and entertainment industry: Screw jacks find applications in stage productions and entertainment events for adjusting stage platforms, lighting rigs, and other equipment to the desired height and position.

screw jack

What is the working principle of screw jack?

1. Mechanical advantage: The screw jack utilizes a screw thread mechanism to convert rotational motion into linear motion. As the handle or motor rotates the screw, it moves along the threaded rod, resulting in vertical movement of the load.

2. Load capacity: The load capacity of a screw jack depends on the size and pitch of the screw thread. The pitch determines the amount of vertical movement per revolution, while the diameter and material of the screw affect its strength and ability to support heavy loads.

3. Self-locking mechanism: Screw jacks are designed with a self-locking mechanism, which helps to prevent the load from lowering or descending unintentionally. The friction between the screw threads provides stability and keeps the load in position.

4. Manual or motorized operation: Screw jacks can be operated manually by turning a handle or using a motor for automated lifting. Motorized screw jacks offer precise control and high lifting speeds, making them suitable for various applications.

5. Lubrication and maintenance: Proper lubrication is essential for the smooth operation of screw jacks. Regular maintenance, including cleaning, inspecting for wear, and lubricating the screw threads, ensures optimal performance and extends the lifespan of the jack.

screw jack

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

1. Operating principle: A screw jack uses a mechanical screw thread mechanism to lift loads, while a hydraulic jack relies on hydraulic fluid pressure to generate force and lift objects.

2. Load capacity: Hydraulic jacks typically have a higher load capacity compared to screw jacks. Hydraulic systems can produce greater force, making them suitable for lifting extremely heavy loads.

3. Speed and efficiency: Screw jacks are generally slower in operation compared to hydraulic jacks. Hydraulic systems can lift loads more quickly and provide faster adjustments.

4. Control and precision: Screw jacks offer precise control and can hold loads in position without additional support. Hydraulic jacks may require additional stabilization measures to maintain stability.

5. Maintenance and complexity: Screw jacks are relatively simple in design and require less maintenance compared to hydraulic jacks, which involve hydraulic fluid, seals, and valves that need regular inspection and servicing.

How to choose or customize the right screw jack?

1. Load requirements: Determine the maximum load capacity needed for your application. Consider both the static and dynamic loads to ensure the screw jack can handle the weight.

2. Lifting speed: Evaluate the required lifting speed to match the desired application. Motorized screw jacks offer faster lifting speeds compared to manual operation.

3. Travel distance: Determine the vertical travel distance needed for your application. Consider the height adjustments required and choose a screw jack with sufficient stroke length.

4. Environmental factors: Consider the operating environment, including temperature, moisture, and potential contaminants, to select a screw jack with suitable corrosion resistance and sealing properties.

5. Integration and customization: Some applications may require specific mounting configurations or modifications. Choose a screw jack supplier that offers customization options to meet your unique requirements.

screw jack

About HZPT

As a leading manufacturer of industrial motors, gearboxes, and drives in China, HZPT is committed to technological innovation and excellent product quality. Our product range includes 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 tooth surface bevel gear reducers, helical-worm gear reducers, parallel shaft helical gear reducers, spiral bevel gear reducers, worm spiral lifting systems, rigid tooth surface gear reducers, and planetary gear reducers.

Our products are widely used in various industrial production lines, including transportation machinery, food machinery, medical machinery, printing machinery, textile machinery, packaging machinery, office equipment, and instrumentation. We are the preferred choice for automation equipment.

Reasons to choose HZPT:

1. Technological innovation: HZPT is dedicated to staying at the forefront of technology and continually developing innovative solutions to meet the evolving needs of the industry.

2. Excellent product quality: Our products undergo rigorous quality control measures to ensure superior performance, durability, and reliability.

3. Customization options: We offer flexible customization options to tailor our products to the specific requirements of our customers.

4. Extensive product range: HZPT offers a wide range of gear motors and reducers to cater to various applications and industries.

5. Reliable customer support: We provide responsive customer support, technical assistance, and after-sales service to ensure customer satisfaction.

Choose HZPT as your trusted supplier of screw jacks and experience the quality and reliability of our products. Contact us today for more information and let us assist you in finding the perfect solution for your 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.