What are the three types of turntables?

Slewing rings, also known as slewing bearings or turntable bearings, are essential mechanical components that enable rotational movement in various industrial applications. They come in different types, each designed to fulfill specific functions and requirements. In this article, we will delve into the three primary types of slewing rings and explore their distinct characteristics and applications.

  1. Single Row Ball Slewing Rings:

    Single row ball slewing rings are the simplest and most common type. They consist of a single row of ball bearings arranged in a circular raceway. These slewing rings are designed to handle axial, radial, and moment loads, making them suitable for a wide range of applications.


    • Compact design.
    • Suitable for moderate load capacities.
    • Low friction, resulting in efficient rotational movement.
    • Cost-effective and widely available.
    • Typically used in applications such as small cranes, excavators, and conveyor systems.
  2. Double Row Ball Slewing Rings:

    Double row ball slewing rings are an advanced variation of the single row type, featuring two rows of ball bearings. This design enhances load-carrying capacity and stability, making them ideal for applications that require higher performance.


    • Increased load-carrying capacity compared to single row slewing ring.
    • Improved stability and resistance to axial and radial forces.
    • Greater precision in positioning and rotation.
    • Commonly used in larger cranes, aerial platforms, and offshore equipment.
  3. Cross Roller Slewing Rings:

    Cross roller slewing rings utilize cylindrical rollers arranged in a crossed pattern between two raceways. This design offers exceptional load-carrying capacity, precision, and rigidity, making them suitable for applications where accuracy and heavy loads are critical.


    • High load-carrying capacity, both axially and radially.
    • Reduced friction and increased efficiency.
    • Minimal deflection and high positional accuracy.
    • Commonly used in robotic arms, machine tools, and precision positioning systems.

Each type of slewing ring has its unique advantages and is selected based on the specific requirements of the application. For instance, single row ball slewing rings are chosen when cost-effectiveness and moderate loads are essential. Double row ball slewing rings step up to the plate when increased load capacity and stability are required, while cross roller slewing rings shine in precision applications with demanding load conditions.

In addition to these primary types, customized slewing rings may be developed to meet specific application needs. These customized designs can incorporate variations in size, materials, sealing mechanisms, and gear options to ensure optimal performance in specialized environments.

Moreover, slewing rings are found in a wide range of industries, including construction, manufacturing, transportation, and aerospace. Their ability to facilitate smooth and controlled rotation under varying loads and conditions makes them indispensable components in machinery and equipment.

In conclusion, slewing rings are versatile and crucial components in many industrial applications, enabling controlled rotational movement under various loads and conditions. The three main types of slewing rings—single row ball, double row ball, and cross roller—offer distinct advantages and are selected based on the specific requirements of the application. The choice of the right slewing ring type ensures efficient and reliable operation in a wide range of industries.

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