Are miniature ball bearings pre-lubricated before use?

Miniature ball bearings are usually pre lubricated before use. This is because lubrication is crucial for the normal operation and extended service life of bearings. Pre lubrication can ensure that bearings have a good lubrication state before installation, thereby reducing friction, wear, and heat generation, and improving the operational efficiency and stability of bearings.
The specific operation of pre lubrication may vary depending on the type of bearing, usage environment, and manufacturer's requirements. Generally speaking, the following are some possible steps that may be involved:
Cleaning: Firstly, it is necessary to clean the assembly surface of the bearing to remove any impurities, grease, or dirt that may be present. This can be cleaned using solvents such as gasoline, kerosene, toluene, or xylene, and wiped dry with a clean cloth.
Oil coating: Apply a thin layer of lubricating oil on the cleaned bearings. This helps reduce friction during installation and ensures that the bearings have sufficient lubrication during initial operation.
Inspection: Before installation, the lubrication condition of the bearing should be checked to ensure that the lubricating oil is evenly distributed in all parts of the bearing.
It should be noted that for sealed bearings, it is generally not recommended to use the above cleaning methods for pre lubrication, as the interior of the seal should be kept intact to avoid damaging its sealing performance. In addition, when selecting lubricating oil, comprehensive consideration should be given to factors such as bearing usage conditions, operating temperature, and speed to ensure that the lubricating oil can meet the lubrication needs of the bearing.
Overall, pre lubrication of miniature ball bearings before use is a common and important operation that helps ensure the normal operation of the bearings and extend their service life. However, the specific pre lubrication methods and steps may vary depending on the type of bearing, usage environment, and manufacturer's requirements, so relevant technical specifications and manufacturer's recommendations should be referred to in practical operation.