71918 ACD/HCP4ADBB
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 71918 ACD/HCP4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class and featuring ceramic balls and a phenolic cage, this bearing is engineered for high-speed operation and long-term reliability in demanding industrial environments.
71918 ACD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex (two bearings in a set) |
| HC | Hybrid Ceramic (Silicon Nitride balls with steel rings) |
| P4A | High Precision Tolerance Class (superior to ABEC 7) |
| DB | Back-to-Back mounting arrangement |
| B | Light Preload |
Structural Features and Performance Benefits
Enhanced Rigidity and Stability: The duplex back-to-back (DB) configuration creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning under combined loads.
Superior High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a phenolic resin cage (lightweight and robust) enables exceptional limiting speeds up to 15,000 rpm, making it ideal for high-speed spindle applications.
High Precision Operation: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring extreme rotational accuracy.
Optimized Preload: The light preload (Class B) is factory-set to eliminate internal clearance, providing high stiffness and precise rotational performance without the need for on-site adjustment.
71918 ACD/HCP4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes.
- High-Frequency Motors and Spindles: Where low vibration and high rotational accuracy are paramount.
- Precision Instrumentation: Medical devices, semiconductor manufacturing equipment, and optical scanners.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other high-performance mechanisms.
