71928 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71928 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71928 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This bearing is supplied as a Quadruplex Back-to-Back (QBC) matched set, delivering superior stability and the ability to handle significant combined loads (radial and axial). Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other critical machinery where maximum performance and reliability are paramount.
71928 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class for superior running accuracy. |
| QBCC | Specifies a Quadruplex (4-bearing) Back-to-Back matched set with a Moderate (Class C) preload. |
71928 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system, capable of withstanding heavy combined loads and moments. This configuration provides optimal support for spindles under complex loading conditions.
High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to the bearing's high limiting speed of 11,000 rpm. This makes it suitable for high-speed applications.
Precision Engineering: Manufactured to P4A tolerance class with a consistent 25° contact angle, this bearing ensures smooth, precise, and low-vibration operation, which is critical for achieving high surface finishes and machining accuracy.
Optimized Material Selection: The use of chrome steel for both rings and balls provides high hardness, wear resistance, and a long operational life under demanding conditions.
71928 ACD/P4AQBCC Bearing Typical Application Areas
The 71928 ACD/P4AQBCC is engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Used in PCB drilling, engraving, and other high-accuracy machining equipment.
- High-Frequency Motors: Applications requiring precise rotor support at high rotational speeds.
