1. Basic code
The basic code of rolling bearings is used to indicate the inner diameter, diameter series, width series and type of bearing of the bearings. Generally, it is at most five digits. Basically nicknames are expressed from the first and second digits from the right. The inner diameter of the commonly used inner diameter D \\u003d 20 to 480mm is generally a multiples of 5. These two digits indicate the number of quotients that are deducted by 5 in the bearing inner diameter, such as 04 indicating d \\u003d 20mm; 12 indicates that d \\u003d 60mm and so on. For the inner diameter of 10mm, 12mm, 15mm, and 17mm, the inner diameter code is 00, 01, 02, and 03. For the inner diameter of less than 10mm and greater than 500mm bearings, there are other regulations for the inner diameter representation method. You can see GB / T272 \\u0026 MDASH; 93.
2) The diameter series of the bearing (that is, a variable series of bearing with the same structure and the same inner diameter in the outer diameter and width) is represented by a third digit from the right to the right. For example, for the toxins and the heart thrust bearing, 0 and 1 indicate a minor series; 2 represents the light series; 3 represents the mid -series; 4 represents the heavy series. The size comparison between each series is shown in the figure below. Except for the thrust bearing to use the 1 to indicate the special light series, the rest is consistent with the display of the Endoacobacter.
3) The width series of bearing (ie, the change series of bearing width in the structure, inner diameter, and diameter series) is represented by the fourth digits from the right to the right. When the width system Figure 13-4 diameter series is compared to the 0 series (normal series), the most bearing can not marked the width series code O in the code, but for the rolling roller bearing and the cone roller bearings, the width series of the width series Code 0 should be marked.
Diameter series code and width series code are collectively called the size series code.
4) The bearing type code is represented by the 5th digit from the right from the right (the type codes such as the cylindrical roller bearing and the roller bearing as the letter).
The rear code of the rear code
The rear code of the bearings is the structure, tolerance and material of the bearing, etc. with letters and numbers, etc. There are many contents of the rear code. Here are some commonly used codes.
1) The internal structure code indicates the different internal structures of the same type of bearings, and the letters are expressed by the basic code with the letters. Such as: the contact angle is 15 \\u0026 deg;, 25 \\u0026 deg; and 40 \\u0026 deg; angle contact ball bearings use C, AC, and B to represent the internal structure.
2) The tolerance level of the bearing is divided into level 2, 4, 5, 6, 6X, and level 0, with a total of 6 levels, from advanced to low levels in turn. The codes are / p2, respectively. / P4, / P5, / P6, / P6X and / P0. In the tolerance level, level 6X is only applicable to cone roller bearings; level 0For the normal level, it is not marked in the rotation code.Essence
3) The commonly used bearing radial gap series is divided into 1 group, 2 groups, 0 groups, 3 groups, 4 groups, and 5 groups.big.The gap in group O is a commonly used gap group. It is not marked in the bearings. The remaining gap groups are represented by / CI, / CZ, / C3, / C4, / CS in the bearings.
The front code
The front code of the bearings is used to represent the sub -component of the bearings, which is represented by letters.If L indicates the separation of the bearing can be separated; K represents the rolling body of the bearings and the holding frame component, and so on.
There are many types of rolling bearings in practical applications, and the corresponding bearing generation number is relatively complicated.The codes introduced above are the most basic and most commonly used parts in the bearing number. If you are familiar with this part of the code, you can identify and check the commonly used bearing.Regarding the detailed code method of rolling bearings, you can check GBT272-93.
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