71938 CD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71938 CD/HCP4ADBB Bearing Product Overview & Core Advantages
The 71938 CD/HCP4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined loads (radial and axial loads) simultaneously from both directions. Manufactured to P4A tolerance class, it delivers ultra-precise running characteristics, making it ideal for high-speed, high-rigidity spindles and other demanding machinery.
71938 CD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 71938: Basic bearing series and size designation (190mm bore, 260mm OD).
- C: Represents a 15° contact angle, optimized for high-speed operation.
- D: Indicates the bearing is part of a duplex (matched) set.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards.
- DB: Specifies the Back-to-Back mounting arrangement for high moment rigidity.
- B: Indicates a Light preload (Class B) for reduced running noise and vibration.
71938 CD/HCP4ADBB Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear, enabling higher limiting speeds and extended service life.
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system capable of withstanding heavy combined loads and moment loads, ensuring precise shaft positioning.
Precision & Speed: The P4A tolerance class and phenolic resin cage contribute to smooth, quiet operation at the high limiting speed of 11,000 rpm. The light preload eliminates internal clearance for immediate precision upon startup.
Thermal Stability: The phenolic cage and hybrid design offer stable performance across the specified temperature range (-30°C to 110°C).
71938 CD/HCP4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Advanced Robotics: Precision joints and arm linkages.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
