7212 CD/P4ATBTA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7212 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 7212 CD/P4ATBTA is a metric precision angular contact ball bearing designed for the most demanding high-precision applications. This bearing is supplied as a triplex back-to-back (TBT) matched set, delivering exceptional system rigidity and stability. Its P4A tolerance class ensures superior running accuracy, while the extra light preload (Class A) minimizes friction and heat generation, making it ideal for high-speed spindles and precision machinery requiring maximum performance and reliability.
7212 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series and size designation (60mm bore, 110mm OD). |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and combined loads. |
| P4A | Denotes a high-precision tolerance class with enhanced dimensional and running accuracy. |
| TBT | Specifies the bearing is part of a Triplex Back-to-Back matched arrangement of three bearings. |
| A | Signifies the Extra Light preload applied to the matched set for optimal stiffness and speed. |
7212 CD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system capable of withstanding complex combined loads (radial and axial) and overturning moments, ensuring precise shaft positioning and minimal deflection.
Optimized for High-Speed Operation: The 15° contact angle and phenolic cage are engineered for high-speed performance, contributing to a limiting speed of 32,500 rpm. The phenolic cage offers low weight and excellent performance under high centrifugal forces.
Superior Precision: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing guarantees exceptional running accuracy and low vibration levels, which is critical for high-precision applications.
High Load Capacity: With a dynamic load rating of 27,900 lbf and a static load rating of 31,500 lbf, this bearing set provides reliable performance under significant loads. The use of chrome steel for rings and balls ensures high durability and fatigue resistance.
7212 CD/P4ATBTA Bearing Typical Application Areas
The 7212 CD/P4ATBTA is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
