Plastic linear bearings are linear sliding bearings made entirely from engineering plastic. LIN series plastic linear bearings consist of two parts, namely an inner lining made from high-performance wear-optimized engineering plastic, and an outer sleeve consisting of anodized magnesium-aluminum alloy. Plastic linear bearings and conventional metal ball linear bearings have different operating principles: The former are subject to sliding friction, and the latter undergo rolling friction. From the perspective of maintenance, while plastic linear bearings are designed for long-term maintenance-free operation, the metal-on-metal contact that occurs between the balls and retainer and between the balls and shaft in conventional metal rolling bearings requires regular oiling; the bearings will produce abnormal noise, suffer strain, and perhaps undergo binding as soon as they lack lubricant. In terms of load-bearing capability, while engineering plastic linear bearings are in direct surface-to-surface contact with the mating shaft, metal ball linear bearings are in point and line contact with the mating shaft; as a result, plastic linear bearings have greater load-bearing capacity than metal ball linear bearings. As for linear motion performance, because engineering plastic linear bearings are subject to sliding friction, while metal ball linear bearings are subject to rolling friction, the latter permit higher linear velocities than the former. In addition, plastic linear bearings have less friction noise than metal ball linear bearings, where the impacts between balls create noise. In terms of corrosion resistance, it is very evident that engineering plastic linear bearings are far more corrosion resistant than metal ball linear bearings.