71903 CEGA/HCP4AH
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71903 CEGA/HCP4AH
Basic Information
System of measurement
Metric
Weight
0.014 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
30 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
760 lbf
Radial static load rating
344 lbf
Limiting speed
80 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71903 CEGA/HCP4AH Bearing Product Overview & Core Advantages
The 71903 CEGA/HCP4AH is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. Engineered with a 15° contact angle and manufactured to P4A super-precision tolerance, this bearing excels in managing combined radial and axial loads. Its compact design, featuring a 17 mm bore and 7 mm width, makes it ideal for space-constrained, high-speed spindles. The use of ceramic balls and a phenolic cage significantly enhances its high-speed capability and thermal stability, while the universal matchable (SU) design allows for flexible mounting configurations in preloaded sets.
71903 CEGA/HCP4AH Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| CEGA | Enhanced internal geometry and ring stabilization for high-precision applications. |
| HC | Hybrid Ceramic construction, featuring silicon nitride (ceramic) balls. |
| P4A | Denotes a super-precision tolerance class, tighter than ABEC 7. |
71903 CEGA/HCP4AH Bearing Structural Features & Performance Benefits
- High-Speed Performance & Rigidity: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage enables a high limiting speed of 80,000 rpm. The 15° contact angle provides optimized stiffness for combined loads.
- Precision & Accuracy: Manufactured to P4A tolerance class with strict bore, OD, and width tolerances, this bearing ensures minimal runout and vibration for superior rotational accuracy.
- Thermal Stability & Longevity: The phenolic cage offers excellent dimensional stability across the operating temperature range (-30°C to 110°C). Ceramic balls are electrically insulating and resist wear, contributing to a longer service life.
- Universal Matching: The Universal Matchable (SU) designation means bearings can be mounted in pairs (as a set of 2) in either back-to-back or face-to-face arrangements to achieve the required preload and system rigidity.
71903 CEGA/HCP4AH Bearing Typical Application Areas
This bearing is specified for high-performance machinery where precision, speed, and reliability are critical. Key applications include:
- High-Frequency CNC Spindles
- Precision Grinding Machine Spindles
- High-Speed Robotics and Automation Drives
- Aerospace Instrumentation and Gyroscopes
- Medical and Dental Handpiece Drives
