71905 ACE/HCP4ADGA
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 71905 ACE/HCP4ADGA is a precision angular contact ball bearing designed for high-performance applications requiring exceptional accuracy and reliability. This universal matchable bearing features a 25° contact angle and is supplied as a pre-lubricated, preloaded pair (SU arrangement), enabling it to handle combined radial and axial loads simultaneously. Manufactured to P4A tolerance class with ceramic balls and a phenolic cage, it delivers superior high-speed capability, minimal thermal expansion, and extended service life in demanding environments.
71905 ACE/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 18mm width) |
| ACE | 25° contact angle, universal matchable design |
| HC | Hybrid ceramic balls (silicon nitride) |
| P4A | High precision tolerance class (ABEC 7/ISO P4) |
| DGA | Preloaded pair (SU arrangement), extra light preload |
Structural Features and Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear, enabling higher limiting speeds (53,000 rpm) and superior performance in high-temperature applications.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring precise shaft positioning and minimal vibration.
Optimized Cage Design: The phenolic cage provides excellent strength-to-weight ratio, reduced centrifugal forces, and compatibility with high-speed operation.
Universal Matchability: The SU arrangement allows bearings to be mounted in any combination (back-to-back, face-to-face, or tandem) without performance degradation, providing design flexibility.
Enhanced Load Capacity: With a dynamic load rating of 1843 lbf and 25° contact angle, the bearing effectively handles combined loads while maintaining precision.
71905 ACE/HCP4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding spindles
- High-Speed Motors: Servo motors, spindle motors, and high-frequency applications
- Aerospace Systems Guidance systems, actuators, and auxiliary power units
- Medical Equipment: Dental handpieces, surgical tools, and imaging devices
- Semiconductor Manufacturing: Wafer handling robots and precision positioning stages
