71928 ACD/HCP4ALDGA
Hybrid Ceramic Super Precision Bearings
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71928 ACD/HCP4ALDGA Bearing Product Overview & Core Advantages
The 71928 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. This universally matchable (SU) bearing is designed to handle combined loads, offering high axial and radial load capacity due to its specific 25° contact angle. Manufactured to the stringent P4A tolerance class, it guarantees superior running accuracy and dimensional stability. A key performance advantage is its ceramic ball and phenolic cage construction, which contributes to lower friction, reduced weight, and the capability for high-speed operation up to 11,000 rpm. Its extra light preload (Class A) ensures smooth, precise rotation with minimal run-out, making it an ideal solution for high-rigidity spindles and precision machinery.
71928 ACD/HCP4ALDGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71928 | Basic Bearing Series & Size | Indicates a high-precision angular contact bearing series with a 140mm bore, 190mm OD, and 48mm width. |
| AC | Angular Contact | Optimized for combined radial and axial loads. |
| D | High Contact Angle (25°) | Provides superior axial load carrying capacity. |
| HC | Hybrid Ceramic | Features ceramic balls for high-speed, low-friction, and non-conductive operation. |
| P4A | Tolerance Class | Denotes a super-precision bearing with extremely tight dimensional and running accuracy tolerances. |
71928 ACD/HCP4ALDGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions. This also provides electrical insulation.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction at high rotational speeds, contributing to the bearing's overall high-speed performance and smooth operation.
- Universal Matchability (SU): This bearing is designed to be universally matchable in any combination (face-to-face, back-to-back, or tandem) without pre-load loss, offering exceptional flexibility in spindle design and assembly to achieve optimal rigidity and accuracy.
- Super-Precision P4A Grade: Manufactured to the highest precision standards, ensuring minimal runout and vibration for applications demanding extreme rotational accuracy.
- High Load Capacity: The 25° contact angle and robust construction provide a high dynamic load rating (32,850 lbf) and static load rating (49,500 lbf), enabling it to handle significant combined loads.
71928 ACD/HCP4ALDGA Bearing Typical Application Areas
The 71928 ACD/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring and testing equipment.
- High-Frequency Motors and Spindles: Applications requiring low inertia and high rotational accuracy.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
