What is a good bearing standard? Whether the bearing is properly selected is very important to whether the machine can run well and increase the service life; whether the company can reduce the maintenance time, reduce the maintenance cost, and improve the operation rate of the equipment. Therefore, whether it is a design scheme manufacturer or a maintenance application enterprise, it is necessary to pay great attention to the selection of bearings. Generally speaking, the question of what is the standard for a good bearing can be summarized as: ① According to the bearing working standard (including load orientation and load type, speed, lubrication method, parallelism regulation, precise or non-precise positioning, installation and Maintenance of the natural environment, working temperature, etc.), to select the basic type, tolerance level and clearance of the bearing to confirm the bearing standard; ② According to the operating conditions, support conditions and service life regulations of the bearing, according to the calculation, specify the bearing model specification, or According to the application regulations, select the bearing model and specification, and then check the service life to confirm the bearing standard; ③ Check the rated load and speed limit of the selected bearing to confirm the bearing standard. For the formulation of bearing selection criteria, the above can be summarized as: the primary consideration for selecting bearings is the limit speed, specified service life and load capacity, and other factors are conducive to clarifying bearing types, structures, specifications and tolerance levels and the final plan for clearance engineering.