71808 ACD/P4DBB
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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71808 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71808 ACD/P4DBB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex pair, supplied in a Back-to-Back (DB) arrangement and preloaded, is engineered to handle combined loads—significant radial and axial loads in both directions simultaneously. Its P4 tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other critical machinery where high rigidity and minimal runout are paramount.
71808 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71808 | Basic bearing series and size designation | Defines the core dimensions: 40mm bore, 52mm OD, 14mm width. |
| AC | Angular Contact design | Optimized for combined radial and axial loads. |
| D | Duplex (Two bearings as a set) | Two bearings are supplied as a matched pair. |
| P4 | Tolerance Class | Denotes high-precision manufacturing tolerances for superior running accuracy. |
| DBB | Back-to-Back Arrangement | Provides high moment rigidity and can support axial loads from both directions. |
71808 ACD/P4DBB Bearing Structural Features & Performance Benefits
Optimized Internal Geometry & High-Grade Materials: The bearing features a 25° contact angle, which provides an excellent balance between radial and axial load capacity. The rings and balls are manufactured from high-purity chrome steel for durability and long service life. The lightweight and robust phenolic resin cage ensures stable operation and low vibration at high speeds (up to 43,000 rpm).
Preloaded Duplex Design for Maximum Rigidity: Supplied as a preloaded Back-to-Back (DB) pair, this configuration significantly increases the system's rigidity and minimizes axial and radial deflection under load. This is critical for applications requiring high positional accuracy and resistance to moment loads.
Precision & Speed Performance: The P4 tolerance class guarantees tight dimensional and running accuracy, contributing to smooth, low-vibration operation. The combination of the phenolic cage and optimized internal design enables the bearing to achieve its high limiting speed.
71808 ACD/P4DBB Bearing Typical Application Areas
The 71808 ACD/P4DBB is engineered for high-performance applications where precision, speed, and rigidity are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives & Feed Systems: High-accuracy ball screws and linear actuators.
- High-Frequency Motors & Spindles: Applications requiring minimal runout and high rotational accuracy.
- Medical & Laboratory Equipment: Centrifuges and other precision rotary devices.
