71905 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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71905 CDGB/HCP4A Bearing Product Overview & Core Advantages
The 71905 CDGB/HCP4A is a high-precision, single-row angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. Its core advantages stem from its P4A super-precision tolerance class and ceramic ball construction, enabling superior rotational accuracy and minimal vibration. The bearing is pre-lubricated and features a light preload (Class B), making it ready for immediate installation in high-speed spindles and other precision machinery where rigidity and low operational torque are critical. Its universal matching (SU) designation allows for simplified mounting in duplex pairs to handle combined loads.
71905 CDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Standard bearing series number, indicating a light series, 25mm bore, 42mm OD, 9mm width. |
| C | 15° contact angle, optimized for high-speed operation and radial load capacity. |
| DG | Universal Matchable (SU). The bearing can be paired in duplex sets (DB, DF, DT) without selective mounting. |
| B | Light preload (Class B). Provides increased rigidity and precise shaft positioning. |
| HC | Hybrid Ceramic. Features ceramic (silicon nitride) balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Super Precision Tolerance Class. Exceeds ABEC 7 standards, ensuring extreme dimensional and running accuracy. |
71905 CDGB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls with a chrome steel ring significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds. This construction is inherently more resistant to wear and degradation.
Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent guidance of the ceramic balls, contributing to smooth operation and high limiting speed (100,500 rpm). It offers good dimensional stability and operates effectively within the specified temperature range.
Precision & Preload: Manufactured to P4A tolerance with a light preload, this bearing delivers exceptional running accuracy, minimizes deflection under load, and provides superior system stiffness, which is vital for applications like machine tool spindles.
Load Handling: The 15° contact angle provides a balanced capacity for combined radial and axial loads. While designed primarily for thrust loads in one direction, its universal matchability allows for the creation of duplex pairs to handle bidirectional axial loads and moment loads.
71905 CDGB/HCP4A Bearing Typical Application Areas
The 71905 CDGB/HCP4A is engineered for the most demanding precision applications, including:
- High-Speed Machine Tool Spindles: CNC milling, grinding, and jig boring machines.
- Precision Instrumentation: High-resolution encoders, measuring devices, and optical scanners.
- High-Frequency Motors and Spindles: Where minimal vibration and maximum rotational accuracy are required.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation components.
