Mounted bearings, also known as bearing units or housed bearings, are assemblies that consist of a bearing (such as a ball bearing, roller bearing, or plain bearing) mounted inside a housing or casing. These units are preassembled and ready for installation, simplifying the mounting process and often eliminating the need for additional bearing support structures. Mounted bearings are designed for easy installation, often requiring minimal alignment or adjustment. Mounted bearings are available with various sealing options to prevent the ingress of contaminants and retain lubrication, enhancing the performance and reliability of the bearing. They come in a variety of designs, sizes, and configurations to accommodate different shaft sizes, loads, speeds, and operating conditions. Some mounted bearings feature features such as relubrication provisions or sealed designs, making maintenance easier and extending the bearing's lifespan.