71928 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71928 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71928 ACDGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it excels at supporting combined loads, particularly high axial loads in one direction. Manufactured to the stringent P4A tolerance class, it offers superior dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery. Its extra light preload (Class A) ensures smooth, low-friction operation right from installation.
71928 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | High-precision bearing design. |
| GA | Universal Matchable (SU) bearing, supplied in a set of 3 for preloaded arrangements. |
| /P4A | Indicates a tolerance class superior to ABEC 7, with very tight limits on bore, outside diameter, and width. |
71928 ACDGA/P4A Bearing Structural Features & Performance Benefits
The performance of the 71928 ACDGA/P4A is derived from its meticulous construction:
- High Rigidity and Load Capacity: The 25° contact angle and robust chrome steel construction provide excellent resistance to deformation under combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 11,000 rpm. The open seal type allows for optimal lubrication flow.
- Precision and Smooth Operation: The P4A tolerance class and extra light preload guarantee minimal runout and vibration, which is critical for achieving superior surface finishes and positioning accuracy.
- Universal Matching: Supplied as a universal matchable (SU) set of three bearings, they can be arranged in various duplex configurations (DB, DF, DT) to achieve specific preload and stiffness requirements.
71928 ACDGA/P4A Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications where speed, accuracy, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables: Indexing and positioning systems.
- High-Frequency Motors and Spindles: Applications requiring minimal vibration and high rotational accuracy.
- Medical and Laboratory Equipment: Centrifuges and precision scanners.
