7214 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7214 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7214 ACDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision and exceptional performance in demanding applications. Positioned in the P4A super precision tolerance class, it delivers unmatched rotational accuracy and dimensional stability. A key advantage is its universal matching capability (SU designation), allowing bearings to be supplied in pre-matched sets of four for simplified installation and optimal preload configuration. The combination of a ceramic ball material and phenolic cage enables superior high-speed performance, while the extra light preload (Class A) ensures low running torque and minimal heat generation, making it ideal for machine tool spindles and other high-accuracy, high-RPM systems.
7214 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7214 | Basic bearing series, defining the standard boundary dimensions (70mm bore, 125mm OD, 24mm width). |
| AC | Angular Contact design with a 25° contact angle, optimized for combined radial and axial loads. |
| DGA | Specific internal design and geometry for high-precision applications. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls with steel rings, reducing centrifugal forces and enabling higher speeds. |
| P4A | The tolerance class, denoting super precision levels with extremely tight dimensional and running accuracy tolerances. |
7214 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of silicon nitride (Si3N4) ceramic balls significantly reduces weight, centrifugal force, and friction compared to all-steel designs. This directly contributes to a higher limiting speed (28,000 rpm), lower operating temperatures, and extended service life.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction at high speeds, further supporting the bearing's high-speed capabilities.
- Super-Precision P4A Tolerance: Manufactured to the strictest P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and positional accuracy in precision machinery.
- High Load Capacity: With a dynamic load rating of 14,918 lbf and a static load rating of 12,375 lbf, the bearing is capable of handling significant combined loads (radial and axial) simultaneously.
- Universal Matchable (SU): Bearings are universally matchable and can be supplied in sets of four. This allows for flexible mounting arrangements (back-to-back, face-to-face, or tandem) to achieve the desired stiffness and preload without selective assembly.
7214 ACDGA/HCP4A Bearing Typical Application Areas
The 7214 ACDGA/HCP4A is specifically designed for high-performance applications where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: High-speed centrifuges and imaging device rotors.
