Bearing Precision Classification:
Bearing precision mainly include the below 3 classifications.
1. Dimensional accuracy during installation
Refer to bearing inner and outer diameter, width, and chamfer.
2. Geometric accuracy during positioning
Refer to the bearing radial dimension deviation and axial deviation.
3. Rotation accuracy when oscillating
Refer to the bearing inner ring and outer ring, radial shaft swing, vertical runout
Selection Reference:
| Applications | Bearing Precision Level | ||||
| Deep Groove Ball Bearing | Cylindrical Roller Bearing | Angular Contact Ball Bearing | Taper Roller Bearing | Thrust Angular Contact Ball Bearing | |
| Ordinary lathe spindle | – | P5、P4 | P5 | P5 | P5、P4 |
| Precision lathe spindle | – | P4 | P5、P4 | P5、P4 | P5、P4 |
| Milling machine spindle | – | P5、P4 | P5 | P5 | P5、P4 |
| Boring machine spindle | – | P5、P4 | P5、P4 | P5、P4 | P5、P4 |
| Coordinate boring machine spindle | – | P4、P2 | P4、P2 | P4、P2 | P4 |
| Mechanical grinding head | – | – | P5、P4 | P4 | P5 |
| High-speed grinding head | – | – | P4 | P2 | P4、P2 |
| Precision instrument | P5、P4 | – | P5、P4 | – | – |
| Supercharger | P5 | – | P5 | – | – |
| Aero engine main shaft | P5 | P5 | P5、P4 | – | – |
World Precision Grade Comparison:
| China/Germany Standard | P2 | P4 | P5 | P6 | P0/() |
| ISO Standard | CLASS 2 | CLASS 4 | CLASS 5 | CLASS 6 | NORMAL |
| America Standard | ABEC9 | ABEC7 | ABEC5 | ABEC3 | ABEC1 |
| Japan Standard | JIS2 | JIS4 | JIS5 | JIS6 | JIS0 |
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