Prefix 1 bearing prefix used to represent parts of the bearing, represented by the letter. As indicated by L separable bearing separable ring; K said rolling body of the bearing and cage assembly etc..
The practical application of the rolling bearing type are many, the bearing code is also more complex. This code is the most basic, the most commonly used part of the bearing code, familiar with this part of the code, the bearing can identify and find the common.

2 basic code (type code, dimension series code, ID code) is used to indicate the basic code of the inner diameter of bearing encoding rules the bearing width, diameter series, series and types, generally for a maximum of five digits, first as follows:
1) bearing diameter with basic code, right up the first H digits. The common inner diameter d=20 ~ bearing inner diameter 480mm is generally a multiple of 5, the two digit represents the inner diameter of bearing encoding rules the bearing is 5 in addition to the quotient, such as 04 for d = 20mm; d = 60mm, 12. Bearing for the inner diameter of 10mm, 12mm, 15mm and 17mm, inner diameter of code 01, followed by 00, 02 and 03. For diameters less than 10mm and greater than 500mm diameter bearing, said method provides otherwise, see the GB / T272 - 93.
2) bearing diameter series (i.e. the same structure, the same bearing outside diameter and width of the Change Series) with the basic code of third digits from right. For example, the radial bearing and thrust bearing, 0, 1 said that the extra light series; 2 said light series; 3 in series; 4 said heavy series. Comparison between the size series as shown below. Thrust bearing in addition to 1 extra light series, agreed with the rest of Journal bearings.