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Linear bearing is a kind of linear motion system, which is used for linear stroke and cylindrical shaft. Because the bearing ball contacts with the outer sleeve of the bearing and the steel ball rolls with the minimum friction resistance, the linear bearing has the advantages of small friction, relatively stable, and does not change with the bearing speed. It can obtain stable linear motion with high sensitivity and high precision. Linear bearing consumption also has its limitations, the most important is the bearing impact load capacity is poor, and the bearing capacity is also poor, followed by linear bearing vibration and noise at high speed. Automatic selection of linear bearing has been included. Linear bearings are widely used in precision machine tools, textile machinery, food packaging machinery, printing machinery and other industrial machinery sliding parts.

Because the bearing ball contacts with the bearing point, the service load is small. The steel ball rotates with very little friction resistance, so it can obtain high precision and smooth motion.

Plastic linear bearing is a kind of linear motion system with self-lubricating characteristics. The biggest difference between plastic linear bearing and metal linear bearing is that metal linear bearing is rolling friction, and there is point contact between bearing and cylindrical shaft, so it is suitable for low load and high speed motion; The plastic linear bearing is sliding friction, and there is surface contact between the bearing and the cylindrical shaft, so it is suitable for high load, medium and low speed motion.