7020 ACDGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7020 ACDGA/HCP4AL Bearing Product Overview & Core Advantages
The 7020 ACDGA/HCP4AL is a single-row angular contact ball bearing engineered for ultra-high precision and demanding applications. Operating under P4A tolerance class, it delivers exceptional dimensional accuracy and rotational precision. Its ceramic ball construction and phenolic cage enable superior high-speed performance with a limiting speed of 16,000 rpm, while the 25° contact angle provides optimal axial load capacity. Preloaded to Extra Light (Class A) standards, this bearing offers universal matchability (SU) for simplified mounting in precision spindle arrangements.
Model Code Breakdown
| Suffix | Technical Meaning | Performance Benefit |
|---|---|---|
| AC | Angular Contact Design | Optimized for combined radial and axial loads |
| DGA | Double Ground Bearings, Universal Match | Precision ground for universal mounting flexibility |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Enhanced speed capability and reduced thermal expansion |
| P4A | Super Precision Tolerance Class | Ultra-precise running accuracy and dimensional stability |
| L | Light Preload | Reduced friction and optimal stiffness for precision applications |
7020 ACDGA/HCP4AL Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: Silicon nitride balls provide 60% lower density than steel, reducing centrifugal forces and enabling higher limiting speeds (16,000 rpm). The ceramic material also offers superior electrical resistance and reduced thermal expansion.
Phenolic Cage Design: The reinforced phenolic resin cage delivers excellent dimensional stability at high speeds while providing inherent lubrication properties and corrosion resistance.
Precision Ground Surfaces: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and minimal vibration.
Optimized Contact Angle: The 25° contact angle provides balanced performance for both radial and axial loading conditions, with dynamic load rating of 17,842 lbf and static load rating of 18,000 lbf.
Universal Matchability: Designed as universal matchable bearings, they can be mounted in various preload configurations without selective matching, simplifying installation in precision spindle assemblies.
7020 ACDGA/HCP4AL Bearing Typical Application Areas
- High-Speed Machine Tool Spindles - CNC machining centers, grinding spindles
- Precision Medical Equipment - Dental handpieces, surgical tools
- Aerospace Systems - Guidance systems, flight control mechanisms
- Semiconductor Manufacturing - Wafer handling robots, precision positioning stages
- High-Frequency Motors - Spindle motors, high-RPM industrial drives
- Test and Measurement Equipment - Coordinate measuring machines, optical instruments
