7212 CD/HCP4ATBTC
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7212 CD/HCP4ATBTC Bearing Product Overview & Core Advantages
The 7212 CD/HCP4ATBTC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set consists of three individual bearings, enabling it to handle significant combined loads (radial and axial) simultaneously. Manufactured to a P4A tolerance class, it delivers superior running accuracy and dimensional stability. The use of ceramic balls and a phenolic cage contributes to its capabilities as a high-speed bearing, with a limiting speed of 36,000 rpm. This configuration is ideal for applications where maximum system stiffness, precision, and reliability are paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series and size designation (60mm bore, 110mm OD). |
| CD | Indicates a triplex back-to-back (TBT) matched set with specific preload and internal clearance. |
| HC | Signifies the use of hybrid ceramic balls (steel rings with ceramic balls). |
| P4A | Denotes the tolerance class, specifying very high precision for both dimensional and running accuracy. |
| TBT | Confirms the Triplex Back-to-Back arrangement of the three bearings in the set. |
| C | Specifies the moderate preload applied to the matched set for optimal rigidity. |
7212 CD/HCP4ATBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back arrangement creates an extremely rigid bearing system, capable of withstanding high moment loads and complex combined loads. This configuration significantly enhances the stability of the entire shaft assembly.
- High-Speed Performance: The combination of hybrid ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a very high limiting speed of 36,000 rpm, making it a premier high-speed bearing solution.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing ensures minimal runout and precise dimensional control, which is critical for applications requiring high rotational accuracy.
- Optimized Preload: The set is supplied with a moderate preload (Class C), which eliminates internal clearance and increases system stiffness without generating excessive heat, ensuring ready-to-install performance.
- Superior Material Selection: The chrome steel rings provide high load-carrying capacity and durability, while the ceramic balls offer advantages in speed, temperature resistance, and service life.
7212 CD/HCP4ATBTC Bearing Typical Application Areas
This high-performance bearing set is engineered for the most demanding precision machinery, including:
- High-Frequency Machine Tool Spindles: For milling, grinding, and drilling where high rigidity, speed, and accuracy are required.
- Precision Robotics: In robotic arm joints and high-accuracy actuators.
- Advanced Aerospace Systems: Including gyroscopes, flight control actuators, and auxiliary power units.
- High-Speed Compressors and Pumps: Where reliability at extreme rotational speeds is critical.
- Medical and Laboratory Equipment: Such as high-speed centrifuges and precision imaging devices.
