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Bearing Precision Selection

the selection of bearing precision

 

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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