71808 ACD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71808 ACD/P4DBC is a high-precision duplex back-to-back angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This P4 tolerance class bearing features a moderate preload (Class C) and is supplied as a matched set of two bearings, enabling it to handle combined radial and axial loads simultaneously. Its compact design and phenolic cage make it ideal for high-speed operation and demanding precision machinery where reliable performance is critical.
71808 ACD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing series and size designation (40mm bore, 52mm OD, 14mm width) |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex arrangement (two bearings supplied as set) |
| P4 | High precision tolerance class |
| DB | Back-to-Back mounting arrangement |
| C | Moderate preload classification |
Structural Features and Performance Benefits
Enhanced Rigidity and Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and provides stable support for rotating components. With a 25° contact angle and 29 high-quality chrome steel balls, this bearing delivers excellent performance under combined loading conditions.
High-Speed Capability: The phenolic resin cage ensures smooth operation at high rotational speeds up to 43,000 rpm, while the lightweight construction minimizes centrifugal forces. The precision-ground raceways and P4 tolerance class contribute to reduced vibration and noise levels.
Precision Engineering: Manufactured with tight dimensional tolerances (bore and OD tolerance: -0.004mm to 0), this bearing maintains precise running accuracy. The moderate preload (Class C) eliminates internal clearance, ensuring precise shaft positioning and improved system stiffness.
Temperature Performance: Constructed from chrome steel throughout, the bearing operates reliably within a temperature range of -30°C to 110°C, making it suitable for various industrial environments.
71808 ACD/P4DBC Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC milling machines
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus
- High-Speed Rotating Systems: Dental handpieces, small precision motors, and turbochargers
- Industrial Automation: Robotics, precision positioning systems, and servo motors
- Aerospace Components: Guidance systems, avionics, and precision actuators
