P6 is the first step above normal, corresponding to ABEC-3. Bore and outer diameter tolerances tighten, width variation drops and runout roughly halves. The result is a bearing that runs quieter and holds a shaft more accurately, at a price increase of 30–60% rather than the 200% jump to P5.
Runout is what produces the once-per-revolution vibration, and P6 roughly halves it. In a fan or a small motor that is the difference between a bearing you can hear across a room and one you cannot. In a gearbox it reduces the excitation that the gear mesh then amplifies.
In a housing bored to H8 and a shaft turned to h9, the fit clearance alone is ten times the runout difference between P0 and P6. The bearing cannot transmit accuracy the housing does not have. Fix the housing first, then consider the class.
| Also written | Class 6, ABEC-3, DIN P6 |
|---|---|
| Typical radial runout | Around 6 µm for a 30 mm bore |
| Price relative to P0 | 130–160% |
| Noise | Clearly lower than P0 in the same housing |
| Typical use | Quiet motors, gearbox spindles, fans, small pumps |
| Also common in | Electric motor grades with a noise specification |
| Does not include | Matched pairing or preload specification |
| Criterion | P0 | P6 | P5 |
|---|---|---|---|
| Radial runout | ~10 µm | ~6 µm | ~4 µm |
| Width variation | Normal | Tighter | Tighter |
| Noise | Standard | Low | Very low |
| Price | 100% | 130–160% | 180–260% |
| Availability | Universal | Very common | Common |
| Typical use | General | Quiet motor, gearbox | Spindle |
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Read →Only if there is a noise or vibration target. For a general-purpose motor P0 is sufficient and P6 adds cost without a functional gain.
A little, because lower runout means less vibration at speed. The real speed limit is still the cage and the lubricant.
Yes, though the range is smaller than for ball bearings. For tapered roller bearings the equivalent step is P6X.
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