Which material is typically used for the outer part of a bearing?

The outer part of a bearing is typically made of metal due to its strength, durability, and ability to withstand the mechanical stresses and friction encountered during operation. Metals, such as steel or aluminum, provide structural integrity, ensuring that the bearing remains stable and functions effectively over time. They also have good wear resistance, which is essential for maintaining performance and extending the lifespan of the bearing.

Materials like plastic or rubber may be used in certain specialized bearings, but they do not offer the same level of strength and heat resistance required for most applications. Wood is generally unsuitable for bearing construction due to its propensity to absorb moisture and deform, compromising performance. Therefore, metal is the preferred material for the outer part of a bearing to ensure reliability and efficiency in mechanical systems.