Straight line bearing is a kind of linear motion system, which is used in the linear travel and cylinder axis. Because of the contact between the bearing ball and the point of the bearing, the ball is rolling with minimum friction resistance. Therefore, the linear bearing has the advantages of low friction and stable. Linear bearing consumption also has its limitations, the main bearing capacity is poor, and the bearing capacity is also poor, followed by linear bearings in high speed movement of the vibration and noise. The quick and easy automatic selection of linear bearing is included. Linear bearings are widely used in precision machine tools, textile machinery, food packaging machinery, printing machinery and other industrial machinery of the sliding parts.

Because the bearing ball bearing contact with the bearing point, the use of the load is small. The steel ball is rotated with minimal friction resistance, so that it can obtain high precision and stable motion.

Plastic linear bearing is a kind of self lubrication characteristics of linear motion system, the biggest difference is that the metal linear bearing is rolling friction, bearing and cylindrical shaft is a point contact, so this is suitable for low load high speed movement, and plastic linear bearings are sliding friction, bearing and cylindrical shaft is surface contact, so this is suitable for high load in low speed motion.