7216 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7216 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7216 ACD/HCP4ADGA is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. This universally matchable (SU) bearing is designed to simultaneously handle combined radial and axial loads from both directions. Its construction with a phenolic cage and ceramic balls enables superior high-speed performance and operational stability. With a P4A tolerance class and an extra light preload (Class A), it delivers the high rigidity and running accuracy essential for advanced machinery, making it a premier choice for precision spindles and high-performance systems.
Model Code Breakdown
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7216 | Basic bearing series and size designation | Defines the standard bearing dimensions: 80mm bore, 140mm OD, 52mm width |
| ACD | Angular Contact, Double Row design | Indicates optimized geometry for handling combined loads and providing high rigidity |
| HC | Hybrid Ceramic (Ceramic balls with steel rings) | Enables higher limiting speeds, reduced friction, and longer service life |
| P4A | Super Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for precision applications |
| DGA | Universal Matchable (SU) arrangement designation | Allows for flexible mounting configurations in pairs without selective matching |
7216 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
Double Row Angular Contact Design: The two rows of balls at a 25° contact angle provide significantly increased load carrying capacity and rigidity compared to single row designs, making it ideal for applications with significant moment loads.
Hybrid Ceramic Construction: The combination of chrome steel rings with silicon nitride (Si3N4) ceramic balls reduces centrifugal forces, lowers operating temperatures, and enables a limiting speed of 28,000 rpm. This construction also provides electrical insulation and enhanced durability.
Phenolic Resin Cage: The lightweight phenolic cage offers excellent dimensional stability at high speeds and temperatures, contributing to smooth operation and reduced vibration.
Universal Matchability (SU): As a universally matchable bearing, any two 7216 ACD/HCP4ADGA bearings can be mounted together in various configurations (back-to-back, face-to-face, or tandem) without selective assembly, simplifying installation and maintenance.
Precision Engineering: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0) ensuring consistent high performance in the most demanding precision applications.
7216 ACD/HCP4ADGA Bearing Typical Application Areas
This high-precision angular contact ball bearing is specifically designed for applications requiring exceptional speed, accuracy, and rigidity:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- High-Speed Motors and Spindles: Electric vehicle motors, aerospace actuators, and industrial spindle drives
- Precision Robotics: Robot arm joints, CNC rotary tables, and automated positioning systems
- Aerospace Systems: Guidance systems, flight control actuators, and auxiliary power units
- Medical Equipment: High-speed dental handpieces, surgical robots, and diagnostic imaging systems
- Semiconductor Manufacturing: Wafer handling robots, precision stages, and inspection equipment
