71920 ACEGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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71920 ACEGA/HCP4AL Bearing Product Overview & Core Advantages
The 71920 ACEGA/HCP4AL is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional rotational accuracy and dimensional stability. A key advantage is its universal matching capability (SU designation), allowing bearings to be mounted in tandem, face-to-face, or back-to-back arrangements to optimize stiffness and handle combined loads. The use of ceramic balls and a phenolic cage enables superior high-speed performance and reduced rotational mass.
71920 ACEGA/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 20mm width) |
| AC | Angular Contact design with a 25° contact angle |
| EGA | Universal Matchable bearing set (SU), typically supplied in sets of 4 |
| HC | Hybrid Ceramic construction with steel rings and ceramic balls |
| P4A | Super Precision tolerance class, exceeding ABEC 7/ISO P4 standards |
| L | Light preload designation (Class A) |
71920 ACEGA/HCP4AL Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This enables higher limiting speeds (16,000 rpm) and extended service life compared to all-steel bearings.
Phenolic Resin Cage: The phenolic cage offers excellent strength-to-weight ratio, providing dimensional stability at high speeds and reduced centrifugal forces. Its self-lubricating properties contribute to smooth operation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width. This ensures minimal runout and vibration for demanding applications.
Optimized Load Capacity: The 25° contact angle is ideal for handling significant axial loads in one direction while supporting substantial radial loads. The universal matching feature allows for creating high-rigidity bearing sets to manage complex combined loads.
71920 ACEGA/HCP4AL Bearing Typical Application Areas
- High-Speed Machine Tool Spindles: For CNC milling, grinding, and turning centers requiring extreme precision and speed.
- Precision Robotics: In robot arm joints and gears where high stiffness and accuracy are critical.
- Medical Equipment: Used in high-speed dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other critical rotating assemblies.
- High-Frequency Motors & Spindles: For applications demanding low vibration and thermal stability at elevated RPMs.
