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Bearing units are a necessary component of many industrial applications, designed to reduce friction between rotating components and provide enhanced support and stability. This guide outlines the key types of bearing units, their advantages, and provides a comprehensive overview of the selection process.

What is a Bearing Unit?

A bearing unit is a stationary housing that supports and contains an internal bearing arrangement. It is designed to reduce the cost and complexity associated with supporting rotating components. Bearing units also reduce the accumulation of dirt, dust, and debris that can interfere with proper bearing operation.

Types of Bearing Units

There are several types of bearing units, including:

  • Plummer Blocks: These bearing units support a single bearing arrangement. They are often used in gearboxes, conveyors, and other rotating machinery.
  • Cartridge Units: Cartridge units take the shape of cylindrical tubes or sleeves. These bearing units are typically used in electrical motors or pumps.
  • Flanged Units: Flanged units feature a “C” or “L” shaped housing that supports a single bearing arrangement. These bearing units are typically used in high-load applications such as pumps and gearboxes.

Criteria for Selecting the Right Bearing Units

When selecting the right bearing unit for your application there are several criteria that must be considered:

  • Application: The application will determine the type of bearing unit required. For example, a gearbox will require a different bearing unit than a pump or an electrical motor.
  • Size: The size of the bearing unit is determined by the dimensions of the application. It is important to ensure that the bearing unit will fit the application correctly and that it is capable of supporting the load requirements.
  • Cost: Cost is an important factor when selecting a bearing unit. It is important to balance the cost against the performance and durability of the unit.


Bearing units are an essential part of many industrial applications. It is important to consider the type of bearing unit, the size, and cost when selecting the unit for an application. By taking the time to understand the criteria and make a well-informed decision, you can ensure the bearing unit is able to meet the demands of the application and provide durable performance.

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