71920 ACDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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71920 ACDGB/HCP4A Bearing Product Overview & Core Advantages
The 71920 ACDGB/HCP4A is a single row angular contact ball bearing designed for high-precision applications requiring superior performance. This P4A tolerance class bearing is characterized by its exceptional dimensional accuracy and running precision. Its key advantages include the ability to accommodate combined loads (radial and axial), high limiting speed capabilities, and universal matchability (SU), allowing for flexible mounting in preloaded arrangements. The use of a phenolic cage and ceramic balls contributes to its high-speed performance and reduced weight.
71920 ACDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| 71920 | Basic bearing series and size code (100mm bore, 140mm OD, 20mm width) |
| AC | Angular Contact design with a 25° contact angle |
| DGB | Universal Matchable (SU) bearing set, designed for duplex mounting |
| HC | Hybrid Ceramic: Features ceramic balls for enhanced performance |
| P4A | High-Precision Tolerance Class, exceeding ABEC 7/ISO P4 standards |
71920 ACDGB/HCP4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Performance: The combination of a phenolic resin cage and ceramic (silicon nitride) balls significantly reduces centrifugal forces and weight, enabling a high limiting speed of 15,000 rpm. This hybrid construction also provides superior rigidity and reduced heat generation.
Superior Load Capacity: With a 25° contact angle, this bearing is optimized to handle significant axial loads in one direction, as well as combined radial and axial loads. The dynamic load rating of 12,870 lbf and static load rating of 14,175 lbf ensure reliable operation under demanding conditions.
Precision & Universal Matchability: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. The Universal Matchable (SU) designation means bearings can be mounted in pairs (back-to-back, face-to-face, or tandem) without selective matching, simplifying installation and achieving the desired preload (Light / Class B).
71920 ACDGB/HCP4A Bearing Typical Application Areas
The 71920 ACDGB/HCP4A is ideally suited for high-performance machinery requiring high rotational accuracy and speed. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In robotic arm joints and spindle drives.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and auxiliary power units.
