71928 ACDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71928 ACDGB/P4A Bearing Product Overview & Core Advantages
The 71928 ACDGB/P4A is a single row angular contact ball bearing engineered for high-precision applications demanding exceptional rotational accuracy and rigidity. Operating under a light preload (Class B), this bearing is designed to primarily accommodate combined loads with high axial load capacity in one direction. Its P4A super-precision tolerance and Universal Matchable (SU) designation ensure superior running accuracy and enable optimized performance in carefully controlled, high-speed spindle arrangements. The open seal type allows for customized lubrication regimes, making it ideal for advanced machine tool and precision equipment applications.
71928 ACDGB/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. |
| DGB | Contact angle and cage guidance specification. |
| P4A | Indicates a super-precision tolerance class, exceeding normal ABEC 7/ISO P4 standards for enhanced running accuracy. |
71928 ACDGB/P4A Bearing Structural Features & Performance Benefits
High Precision and Rigidity: Manufactured to P4A tolerance class with a light preload, this bearing provides exceptional running accuracy and shaft positioning stability, minimizing deflection under load for superior machining quality.
Optimized for High-Speed Operation: The phenolic resin cage offers low weight and excellent sliding properties, contributing to a high limiting speed of 11,000 rpm. The open design facilitates efficient lubrication and heat dissipation, which is critical for high-speed spindle performance.
Superior Load Capacity: The 25° contact angle and robust construction using chrome steel for rings and balls provide a high dynamic (20,340 lbf) and static (24,750 lbf) load rating, enabling reliable operation under significant combined radial and axial loads.
Universal Matching Capability (SU): This bearing is universally matchable, allowing for flexible arrangement in sets (e.g., duplex pairs) without selective mounting, which simplifies installation and ensures pre-defined performance characteristics.
71928 ACDGB/P4A Bearing Typical Application Areas
The 71928 ACDGB/P4A is ideally suited for high-performance machinery requiring the utmost precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding applications.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Aerospace Test Equipment: Precision rotary tables and positioning systems.
