bolt jack

bolt jack


The bolt jack is a specialized lifting device commonly used in various industries. It is designed to provide mechanical advantage through the rotation of a screw mechanism. This article will explore the features, applications, and advantages of the bolt jack.

1. What is a screw jack used for?

The screw jack is a versatile tool with numerous applications:

1.1 Lifting and Lowering

The primary function of a screw jack is to lift heavy loads vertically or lower them safely. It is commonly used in construction, automotive, and manufacturing industries for tasks such as raising machinery, adjusting work platforms, and supporting structures.

1.2 Load Positioning

The precise and controlled movement of a screw jack makes it ideal for load positioning applications. It can be used to adjust the height or angular position of equipment, ensuring accurate alignment and smooth operation.

1.3 Stabilization and Support

Screw jacks are often employed to stabilize and support structures or objects. They provide a reliable means of securing loads, preventing unwanted movement or shifting during operation.

1.4 Leveling and Alignment

With their fine adjustment capabilities, screw jacks are widely used for leveling and aligning machinery or equipment. They enable operators to achieve precise horizontal or vertical orientations, ensuring optimal performance and safety.

1.5 Tensioning and Compression

Screw jacks can be utilized for tensioning or compression applications. They can apply controlled force to achieve desired tension in cables, belts, or other flexible elements. Additionally, they can compress materials in processes such as pressing, molding, or assembly.

screw jack

2. What is the working principle of screw jack?

The working principle of a screw jack involves the conversion of rotational motion into linear motion. It consists of a screw mechanism and a load-carrying platform:

2.1 Screw Mechanism

The screw mechanism consists of a threaded rod and a nut. When the rod is rotated, the nut moves along the thread, causing linear displacement. The pitch of the thread determines the amount of linear movement per revolution.

2.2 Load-Carrying Platform

The load is supported by a platform or saddle connected to the nut. As the nut moves along the thread, it raises or lowers the platform, facilitating the desired vertical movement of the load.

2.3 Mechanical Advantage

The screw jack provides mechanical advantage through its thread pitch. By increasing the pitch, the jack can exert greater force for lifting heavy loads. This mechanical advantage allows for efficient and controlled lifting operations.

screw jack

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

While both screw jacks and hydraulic jacks are used for lifting and supporting loads, they operate on different principles:

3.1 Power Source

A screw jack utilizes mechanical power, usually provided by a hand crank or an electric motor, to rotate the threaded rod. In contrast, a hydraulic jack employs hydraulic fluid and a piston to generate force and lift the load.

3.2 Lifting Mechanism

A screw jack lifts the load by translating rotational motion into linear motion through the screw and nut mechanism. On the other hand, a hydraulic jack uses the principle of Pascal’s law to generate force by applying pressure to the hydraulic fluid.

3.3 Load Capacity

Hydraulic jacks generally have a higher load capacity compared to screw jacks. Hydraulic systems can generate higher forces and are commonly used for heavy-duty lifting applications.

3.4 Speed and Control

Screw jacks offer precise control over the lifting process and allow for finer adjustments. Hydraulic jacks, while faster in operation, may have limited control due to the fluid dynamics involved.

3.5 Maintenance and Cost

Screw jacks are relatively simple in design, requiring less maintenance and offering a cost-effective solution for many applications. Hydraulic jacks, being more complex with additional components, may require more maintenance and have higher initial costs.

screw jack

4. Choosing and Customizing the Right Screw Jack

When selecting or customizing a screw jack, several parameters and considerations are essential:

4.1 Load Capacity

Determine the maximum load the screw jack needs to support. Consider both the static and dynamic load requirements to ensure safe and efficient operation.

4.2 Travel Distance

Specify the required vertical travel distance or stroke length. This parameter will influence the choice of screw jack model and the number of gear sets needed for longer travel distances.

4.3 Operating Speed

Consider the desired lifting speed and the duty cycle of the application. Different gear ratios and motor options are available to achieve the required operating speed.

4.4 Environmental Factors

Take into account the operating environment, including temperature, humidity, and exposure to dust or corrosive substances. Choose screw jacks with appropriate protective coatings or materials to ensure durability and longevity.

4.5 Mounting and Integration

Consider the available space and the mounting options for the screw jack. Determine if additional accessories or modifications are required for seamless integration into the existing system.

screw jack

About HZPT

As a leading manufacturer of industrial motors, gearbox, and drives in China, HZPT is committed to delivering innovative technology and excellent quality products. Our range of products includes:

1. Micro Gear Motors

Compact and efficient gear motors suitable for various small-scale applications.

2. Medium Gear Motors

Versatile gear motors suitable for medium-sized machinery and equipment.

3. Brake Speed Regulating Motors

Motor solutions with built-in braking and speed regulation capabilities for precise control.

4. Torque Motors

High torque motors designed for heavy-duty applications requiring substantial force.

5. DC Motors

Direct current motors suitable for a wide range of industrial and automation applications.

In addition to these, we also offer a comprehensive range of transmission products, including NMRV worm gear motors, bevel gear motors, worm gear screw jacks, helical bevel gear reducers, helical-worm gear reducers, parallel shaft helical gear reducers, spiral bevel gear reducers, worm screw lifts, rigid face gear reducers, and planetary gear reducers. Our products find applications in various industries such as transportation, food processing, medical equipment, printing machinery, textile machinery, packaging machinery, office equipment, and instrumentation, making them the preferred choice for automation systems.

When it comes to screw jack solutions, HZPT offers reliable and customizable options to meet your specific requirements. We pride ourselves on the following advantages:

1. Superior Quality

All our products undergo stringent quality control measures to ensure they meet international standards, providing reliable performance and durability.

2. Customization Options

We understand that every application is unique. That’s why we offer customization options to tailor our screw jacks to your specific needs, including load capacity, travel distance, and operating speed.

3. Technical Expertise

Our team of experienced engineers is dedicated to providing technical support and solutions for your screw jack requirements. We are committed to delivering the highest level of customer satisfaction.

4. Competitive Pricing

We offer competitive pricing without compromising on quality. Our cost-effective solutions ensure you get the best value for your investment.

5. Timely Delivery

We understand the importance of timely delivery. Our efficient production and logistics processes ensure your screw jacks are delivered on schedule, minimizing downtime.


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.