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Understanding Bearing Precision Grades – P5, P4, P2
When sourcing high-precision bearings from China, understanding ISO accuracy grades is essential. The international precision classification system runs as below [0†L29-L31][1†L22-L25]:
P0 (Normal/ABEC1) – Standard industrial grade for general applications
P5 (High Precision/ABEC5) – Required for precision machine tools and automation equipment [0†L22-L23]
P4 (Super Precision/ABEC7) – For high-speed spindles and semiconductor manufacturing [0†L22-L23][0†L41-L42]
P2 (Ultimate Precision/ABEC9) – The highest precision for gyroscopes and quantum computing devices [0†L24-L25][1†L14-L15]
Each ascending grade represents tighter dimensional tolerances and improved rotational accuracy. A P2 bearing maintains outer diameter runout ≤1 micron, while P5 allows ≤5 micron – different specifications for different demands [1†L15-L16]. Higher precision bearings also run smoother, extending service life by reducing dynamic loads and improving lubrication conditions [0†L43-L44].
At Luoyang Ouna Bearing, we manufacture across all grades — delivering P5, P4, and P2 products tailored to your equipment requirements.
Our precision-certified products include:
Thin-walled crossed roller bearings (ORA, ORB, ORE, ORU, ORAU series)
High-precision ORT series rotary table bearings
Precision four-point contact ball slewing bearings
High-precision thrust cylindrical roller bearings
Each Ouna bearing is manufactured with premium bearing steel, precision heat treatment to HRC 60-62, and full ISO traceability.
For international buyers, sourcing precision bearings from Luoyang offers a competitive balance of cost and quality, with complete technical documentation. Whether you need P5 for CNC spindles or P2 for ultra-precision instruments, our engineering team will match the right grade to your application.
Ready to source precision bearings with confidence? Contact us with your technical specifications — we‘ll help you select the ideal grade and configuration.
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