Insulated bearings use a special spraying process, the outer surface of the bearing is sprayed with a high quality coating, the coating has a strong bond with the substrate and good insulating properties, which can avoid the galvanic corrosion effect of the induction current on the bearing, prevent the damage caused by the current to the grease and rolling body and raceway, and improve the service life of the bearing, the process is constantly being improved, in the insulated bearing, there is a 100 μm thick coating on the outer or inner ring surface, which can withstand a voltage of up to 1000 V DC, the special spraying process can form a coating of uniform thickness and extremely strong and even adhesion, and then further treated so that it can be unaffected by moisture and humidity.