Does a sealed ball bearing require lubrication during normal use?

A sealed ball bearing is designed to operate without the need for regular lubrication during its intended use. The sealed design incorporates grease that is packed into the bearing at the time of manufacturing. This grease remains within the bearing and provides adequate lubrication for the life of the bearing under normal operating conditions.

The purpose of the seals is to keep contaminants such as dust and moisture out and to retain the lubricating grease. As a result, it minimizes maintenance requirements and allows the bearing to function efficiently without re-lubrication.

In special scenarios, such as operating under very high loads or extreme environmental conditions, the performance may be affected, but under typical applications, sealed ball bearings are designed to last without additional lubrication.