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First of all, to rolling bearings, for example, respectively, for a number of his predecessors, back numbers, base numbers.
Pre number: in reality, the application of rolling bearing type is many, the number are relatively complex. Front number represents a part of the bearing, English said. K to represent bearing rolling element and cage assembly. Quite detailed introduction of rolling bearings can be found in tapered roller bearing thrust roller bearings.
Post number: rear-mounted bearing number is expressed in English and Arabic numerals as well as bearing materials, tolerances, and structure. Commonly used radial clearance of bearings series is divided into 1 set, 2 sets of 6 groups. Bearing tolerance from high to low is divided into six levels, internal structure of numbers are indicated by a letter followed by the Basic code of bearings of the same type with different internal structures.
Basic numbers: basic numbers indicate the bearing width, diameter, diameter series and type. Bearing type codes indicated by Basic code right from the fifth digit (types, such as cylindrical roller bearings and needle roller bearings code number as letters), bearing diameter with Basic code right from the first digit indicates. Bearing outer diameter and inner diameter of the same structure, the same change in the width of the series indicated by Basic code the third digit from the right. For example, radial for radial bearings and thrust bearings, 0, 1 series light; bearing bore diameter and the width is the same bearings of diameter series series of changes in the Basic code of the fourth digit from the right.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7002CTYNP5 NSK | 15 | 32 | 9 |
| 7001A5TYNP5 NSK | 12 | 28 | 8 |