Sealed vs shielded bearings differences

Sealed vs shielded bearings differences

Sealed vs Shielded Bearings Differences


In the world of bearings, there are various types and designs available to suit different applications. Two common types that often confuse people are sealed bearings and shielded bearings. While they may seem similar, there are key differences between them that can greatly impact their performance and functionality. In this article, we will delve into the distinctions between sealed and shielded bearings, their advantages, and when to choose one over the other.

1. Sealed Bearings

Sealed bearings, as the name suggests, have a seal that surrounds the rolling elements and raceways. This seal provides a physical barrier to protect the internal components from contaminants such as dirt, dust, and moisture. The seal is usually made of rubber or synthetic materials, creating a tight seal to prevent any ingress of external substances. Sealed bearings offer excellent protection and are commonly used in applications where cleanliness and longevity are crucial.

1.1 Advantages of Sealed Bearings

Sealed bearings offer several advantages:

  • Enhanced protection against contaminants
  • Extended service life
  • Reduced maintenance requirements
  • Smoother operation

With the seal acting as a shield, sealed bearings are better equipped to withstand harsh operating conditions and maintain optimal performance throughout their lifespan.

1.2 Application of Sealed Bearings

Sealed bearings find applications in a wide range of industries, including:

  • Automotive
  • Aerospace
  • Industrial machinery
  • Medical equipment

Wherever there is a need for reliable and long-lasting bearings, sealed bearings are an excellent choice.

2. Shielded Bearings

Shielded bearings, on the other hand, utilize metal shields instead of seals. These shields are designed to cover the rolling elements and raceways partially, leaving a small gap between them. The shields act as a barrier to larger particles and provide limited protection against contaminants. Shielded bearings are commonly used in applications where moderate protection is required, and the bearings may need occasional maintenance or lubrication.

2.1 Advantages of Shielded Bearings

Shielded bearings have their own advantages:

  • Good balance between protection and accessibility
  • Easier maintenance and lubrication
  • Lower friction than sealed bearings

The shields allow for easier access to the interior of the bearing, making maintenance and lubrication procedures more convenient. Additionally, the reduced friction of shielded bearings can contribute to improved operating efficiency in certain applications.

2.2 Application of Shielded Bearings

Shielded bearings are commonly used in applications such as:

  • Electric motors
  • Power tools
  • Small appliances
  • Fans

These applications often require bearings that offer a balance between protection and accessibility, making shielded bearings a suitable choice.


In summary, the choice between sealed and shielded bearings depends on the specific requirements of the application. Sealed bearings provide superior protection and longevity, making them ideal for applications that demand a high level of cleanliness and durability. On the other hand, shielded bearings offer a balance between protection and accessibility, making them suitable for applications that require occasional maintenance or lubrication.

About Our Company

Author: Czh

Our company is a leading player in the bearings market in China. We offer a wide range of high-quality products including shielded bearings, track bearings, plastic rollers with bearings, ball bearing rollers, sliding bearings, cup bearings, cage bearings, and more. With 300 sets of various types of automatic CNC production equipment and fully automated assembly equipment, we ensure the precision and efficiency of our manufacturing process.

We take pride in our commitment to delivering top-notch products, competitive prices, and excellent customer service. We welcome customers’ customization requests based on their specific needs and requirements.

Visit our website now to explore our extensive range of bearing solutions and experience the quality, affordability, and exceptional service we offer. Customer satisfaction is our top priority!


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