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What are the features of rotary table bearings?

A rotary table bearing, also known as a slewing bearing or turntable bearing, is a specialized type of rolling-element bearing designed to support axial, radial, and moment loads simultaneously while facilitating rotational movement. These bearings are commonly used in various applications that require smooth and controlled rotation, such as in cranes, excavators, wind turbines, and other heavy machinery. Rotary table bearings play a crucial role in enabling these machines to pivot, swivel, or rotate.

Features of rotary table bearings

rotary table bearing


Rotary table bearings have a unique design that allows them to support heavy loads while enabling 360-degree rotational movement around a central axis. They consist of an inner ring (sometimes called the "race"), an outer ring, rolling elements (such as balls or rollers), and sometimes a cage or separator.

Axial and Radial Load Capacity

These bearings are designed to handle both axial (thrust) and radial (horizontal) loads simultaneously. This ability to support combined loads is one of their defining features. They can also accommodate moment loads, which are rotational forces applied perpendicular to the bearing's axis.

Low Profile

Rotary table bearings are often characterized by their relatively low profile or slim design. This allows them to fit into compact spaces while providing high load capacity.

Precision and Smooth Rotation

They are manufactured with high precision to ensure smooth and precise rotation. This is especially important in applications like machine tools, robotics, and radar systems where accurate positioning is critical.

Gear Options

Some rotary table bearings come with integrated gears (such as external or internal gears) that allow for controlled rotation. These gears can be used in conjunction with motors or other drive systems to achieve precise positioning and motion control.

rotary table bearing

Sealing and Lubrication

To protect the internal components from contaminants and ensure long service life, rotary table bearings are equipped with sealing mechanisms. Lubrication is essential to reduce friction and wear, and it typically needs to be replenished periodically.


Manufacturers offer various sizes, designs, and configurations of rotary table bearings to meet the specific requirements of different applications.


Rotary table bearings find use in a wide range of industries, including construction, aerospace, renewable energy (wind turbines), material handling (cranes), medical equipment, and automation. They are essential components in machinery that requires rotation or swiveling motion.

rotary table bearing


Proper maintenance is crucial to ensure the longevity and reliability of rotary table bearings. This includes routine lubrication, inspection for wear and damage, and addressing any issues promptly.


In applications where human safety is a concern, such as amusement park rides or heavy machinery, rotary table bearings are subjected to rigorous safety standards and inspections.

In summary, rotary table bearings are specialized bearings designed to support heavy loads and enable smooth, controlled rotation in various industrial and machinery applications. Their unique ability to handle axial, radial, and moment loads simultaneously makes them a fundamental component in many complex mechanical systems.

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