71902 CEGA/HCP4AH
Hybrid Ceramic Super Precision Bearings
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71902 CEGA/HCP4AH Bearing Product Overview & Core Advantages
The 71902 CEGA/HCP4AH is a single row angular contact ball bearing designed for ultra-precision applications requiring exceptional rotational accuracy and high-speed capability. Engineered to a P4A super-precision tolerance class, this bearing excels in applications demanding minimal runout and vibration. Its core advantages include the ability to accommodate combined radial and axial loads in one direction, a compact cross-section for space-constrained designs, and superior performance enabled by its ceramic balls and phenolic cage.
71902 CEGA/HCP4AH Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71902 | Basic bearing series and size designation | Indicates a 15mm bore, 28mm OD, 7mm width bearing from the 71902 series. |
| CE | 15° Contact Angle | Optimized for high-speed operation with a balance of radial and axial load capacity. |
| GA | Universal Matchable (SU) bearing set | Two bearings are manufactured to be universally matchable, allowing for flexible mounting arrangements (e.g., back-to-back, face-to-face) to achieve desired preload and rigidity. |
| HC | Hybrid Ceramic | Features ceramic (Si3N4) balls for reduced weight, lower friction, and extended service life, especially at high speeds. |
| P4A | Tolerance Class | Denotes a super-precision tolerance grade with even tighter specifications than ABEC 7 (P4), ensuring extreme running accuracy. |
71902 CEGA/HCP4AH Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and minimizes wear. This results in a higher limiting speed of 140,000 rpm and extended service life.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent guidance for the ceramic balls, contributing to smooth operation and high-speed stability with minimal friction.
Extra Light Preload (Class A): This bearing is supplied with a pre-defined, minimal internal preload. This eliminates initial clearance, enhances system rigidity, and improves positional accuracy without generating excessive heat.
Universal Matching (SU): As part of a universally matchable set, two 71902 CEGA/HCP4AH bearings can be paired in any combination to achieve the precise preload and stiffness required for the application, simplifying installation and optimization.
71902 CEGA/HCP4AH Bearing Typical Application Areas
This high-precision, high-speed angular contact bearing is ideally suited for demanding applications, including:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool main shafts and ball screws
- High-Speed Robotics and automation arms
- Aerospace instrumentation and auxiliary systems
- Medical and Dental handpieces
