7219 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7219 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing features a 25° contact angle and is supplied with a preload, delivering superior rigidity and precise rotational accuracy. Its construction with ceramic balls and a phenolic cage enables outstanding high-speed performance, with a limiting speed of 14,000 rpm. Manufactured to P4 (ABEC-7) tolerance class, it is the ideal solution for machine tool spindles and other high-precision machinery where combination loads and minimal runout are critical.
7219 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7219 | Basic bearing series and size designation (95mm bore, 170mm OD, 32mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high-precision design with enhanced running accuracy. |
| HC | Hybrid Ceramic: Indicates the use of ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4 | Tolerance class equivalent to ABEC-7, denoting ultra-precision dimensions and running accuracy. |
Structural Features and Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, making it an exceptional high-speed bearing.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability at high speeds and is well-suited for the demanding conditions of high-speed applications.
- 25° Contact Angle and Preload: This configuration provides high rigidity and excellent capability to handle combination loads (combined radial and axial loads), ensuring precise shaft positioning and minimal deflection.
- P4 Super-Precision Tolerance: Guarantees extremely tight bearing dimensions and runout tolerances, which is critical for applications requiring the highest levels of rotational accuracy and system performance.
- Open Design with Lubrication: The open seal type allows for optimized lubrication flow and heat dissipation, further supporting its high-speed performance.
7219 ACD/HCP4A Bearing Typical Application Areas
The 7219 ACD/HCP4A is specifically designed for high-performance machinery where speed, precision, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace Equipment: Gyroscopes, navigation systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
