Do you know difference between abec bearings?

As we all know that bearing have difference between abec bearings,do you know the difference between abec bearings?This is some introduction for difference between abec bearings for your reference:
There are four grades of bearings: po-p6-p5-p4-p2. Po-p6-p5-p4-p2 is the national standard and the most common standard in the bearing industry. Therefore, it is also called ordinary grade.Specific also technical parameter also has a standard.A simple summary is as follows: benchmarks for accuracy.

The precision of rolling bearing is divided into (main) dimensional accuracy and rotary accuracy.The precision grade has been standardized into six grades: 0, 6X, 6, 5, 4 and 2.
Accuracy increases from level 0, which is sufficient for general purposes, but level 5 or higher accuracy is required for conditions or situations shown in table 1.
Although the above accuracy level is based on the ISO standard, its name varies from country to country.
Detail difference between abec bearings:
Dimensional accuracy difference between abec bearings (items related to shaft and housing installation)
1. Allowable deviation of inner diameter, outer diameter, width and assembly width
2. Allowable deviation of inner compound diameter and outer compound diameter of roller set
3. Allowable boundary value of chamfering size
4. Allowable variation of width

Rotation accuracy difference between abec bearings (items related to the runout of the rotating body)
1. Allowable radial runout and axial runout of inner ring and outer ring
2. Lateral runout of inner ring is allowed
3. Allowable variation of inclination of outer diameter surface
4. Allowable variation of thrust bearing raceway thickness
5. Allowable deviation and variation of taper hole
Bearing type and applicable accuracy grade
Bearing form applicable standard applicable accuracy grade
Deep groove ball bearing GB307 class 0 class 6 class 5 class 4 class 2
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