7219 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7219 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7219 CDGA/HCP4A is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As a single bearing with a Universal Matchable (SU) designation, it is engineered to be paired with an identical bearing to form a precisely matched set, delivering superior system rigidity and rotational accuracy. Its core advantages include the ability to handle combined loads (radial and axial) efficiently, facilitated by a 15° contact angle. Manufactured to a P4A tolerance class, it guarantees extremely tight dimensional and running accuracy. The use of a phenolic cage and ceramic balls contributes to its high-speed capability, low friction, and extended service life, making it ideal for high-reliability, high-precision machinery.
7219 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 7219 | Basic designation indicating a metric, single-row angular contact ball bearing with a 95mm bore, 170mm OD, and 32mm width. |
| CD | Specifies a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| GA | Indicates a specific preload level (Extra light / Class A), ensuring minimal axial play and precise shaft positioning. |
| HC | Signifies the use of Hybrid Ceramic components, specifically ceramic balls, for reduced friction and enhanced speed performance. |
| P4A | Denotes an ultra-precision tolerance class with extremely tight limits on bore, outside diameter, and width tolerances for superior running accuracy. |
7219 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This construction allows for higher limiting speeds, longer service life, and is less susceptible to lubrication failure compared to all-steel bearings.
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance for the ceramic balls, even at high rotational speeds. Its self-lubricating properties contribute to smooth operation.
- High Precision & Rigidity: Manufactured to P4A tolerance class and featuring an extra light preload (GA), this bearing delivers exceptional running accuracy, minimizes deflection, and provides high system rigidity, which is critical for precise machining and positioning.
- Superior Load Capacity: The 15° contact angle is optimized to handle significant combined radial and axial loads simultaneously. With a dynamic load rating of 31,050 lbf and a static load rating of 27,000 lbf, it is built for demanding operational conditions.
- Universal Matching (SU): This bearing is universally matchable, meaning any two 7219 CDGA/HCP4A bearings can be paired in a duplex set (e.g., back-to-back or face-to-face) without selective assembly, simplifying inventory and installation while ensuring optimal preload and performance.
7219 CDGA/HCP4A Bearing Typical Application Areas
The 7219 CDGA/HCP4A is engineered for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs).
- High-Speed Motors and Spindles: Electric motors, turbine-driven equipment, and dental handpieces.
- Medical Equipment: MRI scanners, CT scanners, and other diagnostic imaging devices.
