71903 CE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71903 CE/HCP4ADBA Bearing Product Overview & Core Advantages
The 71903 CE/HCP4ADBA is a precision angular contact ball bearing supplied as a matched duplex pair in a Back-to-Back (DB) arrangement. Engineered for the most demanding applications, this bearing set is characterized by its extra light preload (Class A) and P4A super-precision tolerance class. Its core advantage lies in its ability to provide exceptionally high running accuracy, rigidity, and performance in high-speed spindle applications, facilitated by its ceramic balls and phenolic cage.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Bearing series and size designation (17mm bore, 30mm OD). |
| CE | Contact angle of 15°. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DB | Duplex Back-to-Back matched arrangement. |
| A | Extra light preload classification. |
71903 CE/HCP4ADBA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing service life, especially at ultra-high speeds.
Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at the limiting speed of 80,000 rpm, offering excellent dimensional stability and low friction.
Matched Duplex DB Arrangement: The Back-to-Back configuration provides high moment rigidity and can accommodate combined radial and axial loads from both directions, making the bearing set exceptionally stable under complex load conditions.
Super-Precision P4A Tolerances: With extremely tight bore diameter, outside diameter, and width tolerances, this bearing ensures minimal runout and superior rotational accuracy for critical applications.
71903 CE/HCP4ADBA Bearing Typical Application Areas
This high-performance bearing set is ideally suited for applications requiring the utmost precision and speed, including:
- High-Frequency CNC Spindles
- Precision Grinding Machine Spindles
- High-Speed Machining Centers
- PCB Drilling & Milling Spindles
- Other precision instruments and rotary systems where high rigidity and minimal thermal growth are critical.
