A sleeve is a hollow cylindrical part, usually used to fix, protect, or connect other components. Below is an introduction to sleeves:

1. Function: The sleeve is mainly used to strengthen and support bearings, pins, and other parts, providing fixation, shock absorption, and protection at the points.

2. Materials: The bushing is usually made of materials such as metal (steel, aluminum, copper) or plastic (nylon, polyethylene), have characteristics of wear resistance, corrosion resistance, and high temperature resistance.

3. Structure: The sleeve is generally cylindrical in shape, with smooth inner and outer surfaces, and usually includes end faces and an inner boreStructure: The sleeve is generally cylindrical in shape, with smooth inner and outer surfaces, and usually includes end faces and an inner bore

4. Type: Depending on the application, bushings can be divided into straight-through bushings, sliding bushings, and reducing bushings, etc.

5. Installation: When installing a sleeve, it usually needs to be used in conjunction with other components to achieve the function of fixation or connection
   

Scope of application:

1. Mechanical equipment:Bushings are widely used in the field of mechanical equipment, used to support and fix bearings, pins and other components, improving stability and work efficiency of the equipment.

2. Automotive industry: In automobile manufacturing, sleeves are commonly used in components such as engines, suspension systems, and transmission systems, serving to secure and vibration.

3. Engineering construction: In the construction industry, sleeves can be used to support various structural components, such as bridges, stair railings, etc., enhancing stability of the structure.

4. Furniture Manufacturing: Bushings are also commonly used in the field of furniture manufacturing, where they connect components of furniture, enhancing the stability and durability the furniture.

5. Electronic products: In the manufacturing of electronic products, sleeves can be used to secure circuit boards, connectors, and other components, ensuring the proper functioning electronic devices.

As a common mechanical part, the sleeve is widely used in various fields such as mechanical manufacturing, automobile industry, engineering construction, furniture manufacturing, and electronic products. It has the characteristics of being simple and practical, and having strong multifunctionality. It plays an important role in the stability and performance of various equipment and structures.