71920 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71920 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a single bearing that is Universal Matchable (SU), it can be precisely paired with a second identical bearing to form a preloaded duplex set, delivering superior performance under combined loads. Its core advantages include a 25° contact angle for excellent axial load capacity, a P4A tolerance class for extreme dimensional and running accuracy, and a phenolic resin cage enabling high-speed operation. This bearing is pre-lubricated and ready for installation, offering a compact and reliable solution for high-performance machinery.
71920 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71920 | Basic bearing series and size designation | Identifies the bearing's dimensions: 100mm bore, 140mm OD, 20mm width. |
| AC | Angular Contact | Designed to support combined radial and axial loads. |
| D | High Ball Count / Enhanced Capacity | Indicates a design with a larger number of balls for increased load rating. |
| GA | Universal Matchable (SU) with "A" Preload | The bearing can be universally matched face-to-face or back-to-back with another to achieve an Extra light preload. |
| HC | Hybrid Ceramic | Features ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Tolerance Class | Denotes a super-precision bearing with tolerances tighter than ABEC 7, ensuring minimal runout and vibration. |
Structural Features and Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm. This construction also offers improved resistance to wear and operates effectively across a wide temperature range (-30°C to 110°C).
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent guidance for the ceramic balls, contributing to smooth operation and high-speed stability with minimal friction.
- High Rigidity and Load Capacity: The 25° contact angle and optimized internal geometry provide superior stiffness and the ability to handle significant combined radial and axial loads, with a dynamic load rating of 12,870 lbf and a static load rating of 14,175 lbf.
- Super-Precision P4A Tolerance: Manufactured to P4A tolerance class, this bearing guarantees exceptional dimensional accuracy and running precision, which is critical for applications requiring high positional accuracy and low vibration.
- Universal Matchability (SU): As a Universal Matchable bearing, any two 71920 ACDGA/HCP4A bearings can be paired without selective matching, simplifying inventory and assembly while ensuring consistent preload and performance in duplex sets.
71920 ACDGA/HCP4A Bearing Typical Application Areas
The 71920 ACDGA/HCP4A is engineered for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary actuators.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and imaging scanner gantries.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
