What is the characteristic feature of a shielded bearing?

The characteristic feature of a shielded bearing is that it has metal covers that seal in the lubricant while protecting the rolling elements from contaminants. These metal shields act as barriers, preventing dirt, dust, and moisture from entering the bearing, which can prolong the bearing's life and maintain its performance. The use of metal for the shields serves not only the function of sealing but also contributes to the overall durability of the bearing in various operating conditions.

Additionally, the metal construction is often better suited for high-speed applications compared to alternatives, as it can withstand wear and friction more effectively. Thus, the design of shielded bearings promotes optimal lubrication retention and reduces the frequency of maintenance required due to contamination.