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How to Read Bearing Numbers

The first number or the first letter or the combination of letters indicates the bearing type.

There are 9 types of bearing:

  1. Category 0: Double row angular contact ball bearings (usually being omitted)

  1. Category 1: Self-aligning ball bearings

  1. Category 2: Spherical roller bearings, spherical roller thrust bearings

  1. Category 3: Tapered roller bearings

  1. Category 4: Double row deep groove ball bearings

  1. Category 5 : Thrust ball bearings

  1. Category 6: Deep groove ball bearings

  1. Category 7: Angular contact ball bearings

  1. Category 8: Cylindrical roller thrust bearings

The last two numbers reflect the ISO size series.The first number represents the width or height series (dimension B, T or H respectively), and the second number represents the diameter series (dimension D). The last two numbers of the basic model number are the size code of the bearing and the numbers multiply by 5 can get the  inner diameter in millimeters.

Extended information:

Bearings are high-precision product. If it is assembled improperly, it will easily cause damage to the bearing raceway, resulting in bearing damage. When assembling the bearing, it need to use a specified mold and it can not be knocked at will. When pressing into the shaft, only can put stress on the small circle.And for the larger circle, only the large circle can be put stress when being pressed. It is required to use air pressure or hydraulic pressure while assembling. During the installation, the upper and lower molds should be at the horizontal state. If they are inclined, the bearing channel will be damaged due to the extra force.

DALIAN GUANGYAGN BEARING is a professional ball bearing company, we focuses on producing different types of ball bearings and roller bearings with high quality. Want to know cycle ball bearing price or more, please contact us.


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