7019 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7019 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7019 CDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional performance. Operating under a P4A tolerance class, it delivers superior rotational accuracy and dimensional stability. Its defining characteristics include an extra light preload (Class A) for minimal running torque and high rigidity, and the use of ceramic balls which significantly reduce friction, heat generation, and wear, enabling higher limiting speeds. This bearing is designed to handle combined loads, primarily thrust loads, with high efficiency and is supplied pre-lubricated for immediate use. It is also part of a Universal Matchable (SU) set, allowing for precise preload control when mounted in specific arrangements.
7019 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance & Benefit |
|---|---|---|
| 7019 | Standard bearing series number (Bore: 95mm, OD: 145mm, Width: 24mm) | Defines the core bearing dimensions. |
| C | 15° Contact Angle | Optimized for handling high thrust loads. |
| DGA | Specific manufacturer designation for a Universal Matchable (SU) bearing with a phenolic cage. | Enables precise preload setting when used in matched pairs or sets. |
| HCP4A | Combined suffix: HC (Hybrid Ceramic balls), P4A (Tolerance Class) | HC denotes hybrid construction with ceramic balls for high-speed performance and longer life. P4A indicates ultra-high precision tolerances exceeding ABEC 7. |
7019 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and ceramic balls drastically reduces centrifugal forces, lowers operating temperature, and provides electrical insulation. This is critical for achieving the high limiting speed of 15,000 rpm.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability at high speeds and is well-suited for the demands of high-speed applications.
- Ultra-Precision P4A Tolerance: With exceptionally tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration, which is essential for high-precision spindles.
- Extra Light Preload (Class A): The built-in preload increases system rigidity, improves rotational accuracy, and minimizes axial and radial play under operational conditions.
- Universal Matching (SU): As a universal match bearing, it can be paired with another identical bearing in various configurations (back-to-back, face-to-face, tandem) to achieve specific preload and stiffness characteristics without selective mounting.
7019 CDGA/HCP4A Bearing Typical Application Areas
This high-performance angular contact ball bearing is ideally suited for the most demanding applications across various industries:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Joints and arm assemblies requiring high rigidity and accuracy.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units.
- High-Frequency Motors and Spindles: PCB drilling spindles and electric motor shafts.
- Medical Equipment: Dental handpieces and high-speed centrifuges.
