71902 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71902 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71902 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its core advantage lies in its ability to handle combined radial and axial loads simultaneously with minimal runout, making it ideal for spindles and other high-speed, high-rigidity systems. The combination of a ceramic ball material and a phenolic cage contributes to superior high-speed performance, reduced weight, and extended service life.
71902 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD). |
| C | 15° contact angle. |
| DG | Universal Matchable bearing. Can be mounted in pairs (Duplex) to adjust preload and rigidity. |
| A | Extra light preload class. |
| HC | Hybrid Ceramic: Features ceramic balls and steel rings. |
| P4A | Super precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
71902 CDGA/HCP4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Design: The phenolic resin cage offers excellent strength-to-weight ratio and low friction, enabling the bearing to achieve its high limiting speed of 230,000 rpm. The 15° contact angle provides an optimal balance between radial load capacity and moderate axial load capacity.
Hybrid Ceramic Construction: The use of ceramic (Si3N4) balls significantly reduces centrifugal forces, lowers operating temperature, and provides superior resistance to wear and electrical arcing compared to all-steel bearings. This results in longer life, especially in high-speed applications.
Ultra-Precision & Preload: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The extra light preload (Class A) minimizes axial and radial play without generating excessive heat, ensuring high positional accuracy and system stiffness from startup.
Universal Matching Capability: The Universal Matchable (SU) designation means these bearings are supplied with selectively graded inner and outer ring widths. This allows for precise preload control when mounted in pairs (back-to-back, face-to-face, or tandem), simplifying assembly and optimizing performance for specific application requirements.
71902 CDGA/HCP4A Bearing Typical Application Areas
The 71902 CDGA/HCP4A is specifically designed for demanding, high-performance machinery, including:
- High-Frequency Machine Tool Spindles (for milling, grinding, drilling)
- Precision Robotic Drives and Servo Motors
- High-Speed Dental Handpieces
- Aerospace Gyroscopes and Navigation Instruments
- Semiconductor Manufacturing Equipment
