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Bearing Tolerance Class P4
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 | ||||||
Contact Us:
If you have any questions of Bearing Tolerance Class P4, please feel free to contact us. We will give you reply within 12 hours!
Questions that help before the next bearing decision after Bearing Tolerance Class P4
Which next options usually help after reviewing Bearing Tolerance Class P4?
Most buyers benefit from one broader family destination, one more commercial route, and one supporting guide that answers the next practical question. That combination usually turns research into a clearer shortlist.
Why add related bearing destinations beside Bearing Tolerance Class P4?
Because the first answer often leads to a second question about fit, applications, supplier choice, or repeat-order confidence. Keeping those next destinations close reduces unnecessary backtracking.
When is it worth moving from reading into a quote or product review?
That move usually makes sense once the topic has narrowed the likely bearing family and the remaining unknowns are commercial, dimensional, or application-specific rather than purely educational.
What usually makes the next bearing decision easier after Bearing Tolerance Class P4?
The process is often easier when the wider family view, the more commercial destination, and one practical guide stay visible together. That keeps the decision grounded in both application detail and buying reality.
Buyer FAQ
Questions buyers ask before choosing the next bearing option
What is the main takeaway from Bearing Tolerance Class P4?
The main takeaway is that bearing tolerance class p4 should be checked against the bearing family, dimensions, load direction, speed, and operating conditions instead of relying on the title or size alone.
When should I use this guide before requesting a quote?
Use the guide when you are comparing bearing models, checking suffix meanings, confirming seal or clearance choices, planning maintenance, or preparing details for replacement, production, or OEM sourcing.
How does this topic connect to bearing supply?
The topic supports the Bearing Supply decision path by helping buyers understand fit, performance, specification details, or maintenance factors before choosing a product page or contacting the team.
Can this guide replace a final specification check?
No. The guide helps prepare the decision, but a final check should still confirm the part number, dimensions, load, speed, seal, clearance, precision, application, and order quantity.
What should I send if I need help after reading this guide?
Send the bearing number, measured size, photos if available, application, quantity, and any special operating conditions. That gives the team enough context to recommend the right product family or quote route.
Need help checking fit, price, or lead time? Request a bearing quote
