Group 1, internal structure code, is used to represent bearings with the same type and boundary dimension but different internal structure. The specific codes and meanings are shown in the chart; Group 2,is the sealing, dustproof, and external shape code, and the specific codes and meanings are shown in the chart; Group 3, cage and its material code. Generally, when the cage of the bearing is different from the specified structure and material, the corresponding suffix code needs to be compiled. The specific codes and meanings are shown in the chartt; Group 4,is the  bearing part material code, and the specific codes and meanings are shown in the chart; Group 5, is the tolerance grade code, and the specific codes and meanings are shown in the chart; Group 6, is the clearance code, and the specific codes and meanings are shown in the chart( When the tolerance grade code and clearance code need to be represented simultaneously, they can be simplified by combining the tolerance grade code with the clearance group number. For example,/P63 represents bearing tolerance grade 6 and radial clearance 3 groups. ) Group 7, is the arrangement code, and the specific codes and meanings are shown in the chart; Group 8, vibration and noise codes, and the specific codes and meanings are shown in the chart; Group 9, other codes, are generally compiled corresponding suffix codes when there are special requirements for bearing friction torque, operation temperature, lubrication, etc. The specific codes and meanings are shown in the chart; Group 10, is the code of bearing with attachments, and the specific codes and meanings are shown in the chart.