Bearing models generally have a pre-code, a basic code and a post-code. Under normal circumstances, the bearing model is only represented by the basic model. The basic model generally contains three parts, type code, size code and inner diameter code. The detailed distinction method is as follows:
1. The inner diameter of the bearing is indicated by the first and second digits from the right of the basic code. For commonly used bearings with inner diameter d=20~480mm, the inner diameter is generally a multiple of 5. These two digits represent the quotient of the inner diameter of the bearing divided by 5, such as 04 for d=20mm; 12 for d=60mm and so on.
2. The diameter series of the bearing (that is, the series of changes in the outer diameter and width of the bearings with the same structure and the same inner diameter) are represented by the third digit from the right of the basic code. For example, for radial bearings and radial thrust bearings, 0, 1 means extra light series; 2 means light series; 3 means medium series; 4 means heavy series; 7 means super extra light; 8, 9 means super extra light.
3. The width series of the bearing (that is, the change series of the bearing width with the same structure, inner diameter and diameter series) is represented by the fourth digit from the right of the basic code. 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.
