For example, angular contact ball bearings with contact angles of 15°, 25° and 40° use C, AC and B to indicate the difference in inteal structure. 1) The inteal structure code refers to the different inteal structure of the same type of bearing, which is indicated by a letter followed by the basic code.

There are many post code names. If you are familiar with this part of codes, you can identify and select commonly used bearings. Among the tolerance grades, 6X grade is only applicable to tapered roller bearings; grade 0 is ordinary grade, which is not marked in the wheel bearing code. The codes introduced above are the most basic and commonly used parts of bearing codes.ufeff1 Basic code It is used to indicate the inner diameter, diameter series, width series and type of the bearing, generally up to five digits, as follows: 1) The inner diameter of the bearing is represented by the first roller bearings and H digits from the right of the basic code.

3 Prefix code The front code of the bearing is used to indicate the sub-components of the bearing, which is indicated by letters. Example: 30210/P6X3 refers to the front bearing code (tapered roller bearing) 02 refers to the size series code 10 inner diameter code (nominal inner diameter is 10 times 5 equals 50mm) p6X rear code, indicating that the level meets the standard 6X level.

When the comparison of the diameter series in Figure 13-4 is listed as 0 series (normal series), the width series code O may not be marked in the code for most bearings, but for spherical roller bearings and tapered roller bearings, width series Code 0 should be marked. 2) Bearing tolerance levels are divided into 2 levels, 4 levels, 5 levels, 6 levels, 6X levels and 0 levels, a total of 6 levels, from high to low, the codes are /PZ, /P4 /PS, / P6, /P6X and /PO. 3) The commonly used bearing radial clearance series are divided into 1, 2, 0, 3, 4 and 5 groups, a total of 6 groups, the radial clearance is from small to large. 

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