71930 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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71930 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71930 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 25° contact angle for optimal axial load capacity. Its extra light preload (Class A) ensures minimal running noise and vibration, making it ideal for high-speed operation up to 11,000 rpm. The use of ceramic balls and a phenolic cage contributes to reduced weight, lower friction, and enhanced durability in high-velocity scenarios.
71930 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing designation, defining the bearing dimensions (150mm bore, 210mm OD, 28mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Enhanced internal geometry for optimized performance. |
| GA | Indicates a specific preload level (Extra light / Class A). |
| HC | Hybrid Ceramic construction, featuring ceramic balls and steel rings. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy. |
71930 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
This precision bearing incorporates several advanced features that deliver superior operational benefits:
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, enabling higher limiting speeds (11,000 rpm). This construction also provides inherent electrical insulation, reduced thermal expansion, and extended service life in contaminated or poorly lubricated environments.
- Phenolic Resin Cage: The lightweight, high-strength phenolic cage offers excellent dimensional stability at high speeds, contributing to smooth operation and reduced vibration.
- Universal Matchable (SU) Design: The bearing is manufactured to universal matching standards, allowing multiple bearings to be mounted together in a set (typically 3 bearings) to share loads effectively and simplify installation in high-rigidity spindle arrangements.
- Superior Precision (P4A): With extremely tight dimensional and running accuracy tolerances, this bearing ensures minimal rotational error, which is critical for applications requiring high positional accuracy and finish quality.
71930 ACDGA/HCP4A Bearing Typical Application Areas
The 71930 ACDGA/HCP4A is engineered for high-performance machinery where speed, precision, and reliability are paramount. Key application sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
