The mechanical bushing is made of metal powder as the main raw material and mixed with different metal accessories according to special needs. Using a hydraulic or mechanical press, direct compression molding, followed by a sintering process to improve the physical and mechanical properties of the bushing. The shaft sleeve manufactured by powder metallurgy has the characteristics of low cost, vibration absorption, low noise, and no need for lubrication, and is especially suitable for environments where oil pollution is not allowed or lubrication is inconvenient. These powder metal sintered bushings are used in car starters, cooling systems, brake systems, oil pumps and electric motors, as well as household appliances such as washing machines, electric fans, juicers, coffee makers and vacuum cleaners. This metal powder bushing is extremely reliable and can operate for thousands of hours without wear. They are also maintenance-free and require no lubricant.