Linear bearing is a kind of rolling or sliding bearing used for linear motion. It has the characteristics of small friction force, reliable structure, strong bearing capacity, high accuracy for long-distance operation and long service life. Linear bearing is mainly used for the use of linear stroke with cylindrical shaft. Rolling is achieved with minimal frictional resistance through the contact between the bearing ball and the bearing jacket point. This design makes the linear bearing have the characteristics of low friction and high stability. It will not change with the change of bearing speed, and can obtain smooth linear motion with high sensitivity and high precision. Linear bearing is widely used in the sliding parts of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, printing machinery, etc.