Linear bearing is a linear motion system, consisted of an outer race,retainer,balls and end rings, used for linear stroke and cylindrical shaft, there are metal liner bearing and plastic liner bearing. According to the shape, it can be divided into: 1: Straight cylinder type (shaped like a cylinder, usually installed with a clip spring, used for smaller mounting sizes). 2: Flange type (the end or middle of the installation flange, can be installed with screws, flange generally divided into round, square and cut edge three types). 3: Open-mouth type (shape is like straight cylinder, with axial slit on the outside, used for occasions requiring clearance adjustment, including large opening and small opening). Application: Precision machine, tools textile machinery, food packaging machinery, printing machinery and other industrial machinery etc.