The basic code  indicates the inner diameter, diameter series, width series and type of the bearing,generally up to five digits.

1.The bearing inner diameter is indicated by the first and H digits from the right of the basic code. Commonly used bearing inner diameters with inner diameter d=20～480mm are generally multiples of 5. These two digits represent the quotient of the bearing inner diameter size divided by 5. For example, 04 means d=20mm; 12 means d=60mm and so on. For bearings with inner diameters of 10mm, 12mm, 15mm and 17mm, the inner diameter codes are 00, 01, 02 and 03 in sequence. 

2.The diameter series of the bearing (that is, the series of changes in the outer diameter and width of the bearing with the same structure and the same inner diameter) is represented by the third digit from the right of the basic code. For example, for radial bearings and radial thrust bearings, 0 and 1 represent extra light series; 2 represent light series; 3 represent medium series; 4 represent heavy series.

3.The width series of the bearing (that is, the series of changes in bearing width with the same structure, inner diameter and diameter series) is represented by the fourth digit from the right of the basic code. When the comparison of the diameter series in Figure 13-4 is listed as 0 series (normal series), for most bearings, the width series code O may not be marked in the code, but for spherical roller bearings and tapered roller bearings, the width series Code 0 should be marked.

The diameter series code and the width series code are collectively referred to as the size series code.

4.The bearing type code is represented by the fifth digit from the right of the basic code (letters for cylindrical roller bearings and needle roller bearings).

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