7021 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7021 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7021 CDGA/HCP4A is a single-row angular contact ball bearing engineered for the most demanding high-precision and high-speed applications. Its defining characteristic is the Universal Matchable (SU) designation, allowing it to be precisely preloaded in sets of three to achieve exceptional system rigidity and rotational accuracy. Manufactured to the stringent P4A tolerance class, this bearing features a ceramic ball and phenolic cage combination, delivering superior performance under high centrifugal forces and thermal stability. It is capable of supporting combined radial and axial loads simultaneously, making it an ideal solution for spindles requiring maximum precision and speed.
7021 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7021 | Basic Bearing Series & Size | 105 mm bore, 160 mm OD, 26 mm width. |
| CD | 15° Contact Angle | Optimized for high-speed operation and moderate axial load capacity. |
| GA | Universal Matchable (SU) with "A" Preload | Bearing is part of a universally matchable set designed for extra light preload when mounted with two other bearings. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls, which reduce weight, friction, and heat generation, enabling higher limiting speeds. |
| P4A | Tolerance Class | Exceeds ABEC 7/ISO P4 precision, with even tighter tolerances on running accuracy for superior performance. |
7021 CDGA/HCP4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Performance: The combination of a lightweight phenolic resin cage and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces and inertial mass. This allows the bearing to achieve an exceptionally high limiting speed of 16,000 rpm while maintaining dimensional stability and system rigidity.
Precision & Universal Matchability: Manufactured to P4A super-precision standards, this bearing guarantees minimal runout and vibration. The Universal Matchable (SU) feature means any three bearings from this group can be assembled together without selective matching, simplifying installation and ensuring consistent, predictable preload and performance in a triple-set arrangement.
Superior Load Capacity & Thermal Stability: The 15° contact angle provides an excellent balance between radial and axial load carrying capacity. The hybrid ceramic design offers lower thermal expansion compared to all-steel bearings, maintaining precision and preload over a wide temperature range from -30°C to 110°C.
7021 CDGA/HCP4A Bearing Typical Application Areas
The 7021 CDGA/HCP4A is specifically designed for high-end machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for integrally mounted motor applications.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
