7020 ACDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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7020 ACDGB/HCP4A Bearing Product Overview & Core Advantages
The 7020 ACDGB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. As a P4A tolerance class bearing, it delivers superior dimensional and running accuracy. Its 25° contact angle is optimized to handle significant combined loads—both radial and axial—simultaneously. A key advantage is its Universal Matchable (SU) designation, allowing two bearings to be precisely matched for preload control in duplex arrangements. The combination of a phenolic cage and ceramic balls enables outstanding high-speed performance up to 16,000 rpm, while the light preload (Class B) ensures smooth operation with minimal vibration.
7020 ACDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| AC | Angular Contact | Optimized for combined radial and axial loads |
| DGB | Duplex Arrangement, Back-to-Back (Universal Matchable) | Enables precise bearing pairing for rigid setups |
| HC | Hybrid Ceramic (Ceramic Balls) | Enhanced speed capability, reduced heat generation |
| P4A | High Precision Tolerance Class | Superior running accuracy and dimensional stability |
7020 ACDGB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls with chrome steel rings significantly reduces centrifugal forces, enabling higher limiting speeds (16,000 rpm) while maintaining dimensional stability across a wide temperature range (-30°C to 110°C).
Phenolic Cage Design: The phenolic resin cage provides excellent strength-to-weight ratio and operates effectively at high speeds with minimal friction, contributing to the bearing's exceptional high-speed performance.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0), this bearing ensures precise shaft positioning and smooth operation in demanding applications.
Universal Matching Capability: As an SU designation bearing, two units can be universally matched to create preloaded duplex sets, providing enhanced system rigidity and precise axial positioning.
7020 ACDGB/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers and precision grinding spindles
- Precision Instrumentation: Measuring devices and laboratory equipment requiring exceptional accuracy
- Aerospace Systems: Gyroscopes, navigation systems, and auxiliary power units
- High-Speed Motors: Spindle motors and high-frequency electric motors
- Medical Equipment: Dental handpieces and imaging system rotating components
