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Plastic-coated bearings generally refer to a layer of plastic on the outer bread of the bearing. The plastic materials are generally nylon PA, polyoxymethylene POM and engineering plastics polypropylene and pp. Outsourcing plastic has certain hardness, impact resistance, friction resistance and certain self-lubricating type. Plastic-coated bearings are a newly emerging industry in China. They are widely used in machinery and equipment, industrial assembly lines, furniture and hardware accessories. According to different application purposes, the outer shape of the plastic-coated bearing can be made into different shapes, and it can be made into a pulley such as a V-shaped groove. V-groove, etc.