Bearing Tolerance Class P4 Introduction:
Bearing tolerance class P4 is one of the bearing classes.
The dimensional and geometrical tolerances of bearings are described by their tolerance classes (Tolerances).
Select the tolerance class for a bearing based on the application requirements for precision of rotation and operational speed.
P4 class bearing belongs to super precision bearing.
Normally P4 class bearings are widely used in below applications,
Precision lathe spindle, milling machine spindle, boring machine spindle, coordinate boring machine spindle, mechanical grinding head, high-speed grinding head, precision instrument, aero engine main shaft and so on.
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 |
Bearing Tolerance Class P4/ABEC7 Standard:
| Inner Diameter | Average Bore Deviation | Average Outer Diameter Deviation | Width Deviation of Inner and Outer Ring | |||||
| over | t0 | upper deviation | lower deviation | upper deviation | lower deviation | upper deviation | deviation under normal | amend lower deviation |
| 0.6 | 2.5 | 0 | -4 | 0 | -4 | 0 | -40 | -250 |
| 2.5 | 10 | 0 | -4 | 0 | -4 | 0 | -40 | -250 |
| 10 | 18 | 0 | -4 | 0 | -4 | 0 | -120 | -250 |
| 18 | 30 | 0 | -5 | 0 | -5 | 0 | -120 | -250 |
| 30 | 50 | 0 | -6 | 0 | -6 | 0 | -120 | -250 |
| 50 | 80 | 0 | -7 | 0 | -7 | 0 | -120 | -250 |
| 80 | 120 | 0 | -8 | 0 | -8 | 0 | -150 | -250 |
| 120 | 150 | 0 | -10 | 0 | -9 | 0 | -200 | -380 |
| 150 | 180 | 0 | -12 | 0 | -10 | 0 | -250 | -380 |
| 180 | 250 | 0 | 0 | -11 | 0 | -300 | -500 | |
| 250 | 315 | -13 | ||||||
| 315 | 400 | -15 | ||||||
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