71808 ACD/P4DT
71800 Series Super Precision Angular Contact Ball Bearings
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71808 ACD/P4DT Bearing Product Overview & Core Advantages
The 71808 ACD/P4DT is a super-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. This duplex tandem (DT) matched pair configuration delivers superior axial load capacity in one direction, making it ideal for high-speed spindles and precision machinery. Manufactured to P4 tolerance class, it ensures minimal runout and vibration for optimal performance. Its compact design, combined with a phenolic cage and factory-applied lubrication, enables reliable operation at limiting speeds up to 56,000 rpm.
71808 ACD/P4DT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing designation (40mm bore, 52mm OD, 14mm width) |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex bearing set |
| P4 | High precision tolerance class (superior running accuracy) |
| DT | Duplex Tandem arrangement for maximum unidirectional axial load capacity |
71808 ACD/P4DT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem configuration combines two bearings to create an exceptionally rigid assembly capable of handling heavy combined loads. The 25° contact angle optimizes axial load carrying capacity while maintaining radial load performance.
Superior High-Speed Performance: The lightweight phenolic resin cage provides excellent dimensional stability at high speeds, contributing to the impressive 56,000 rpm limiting speed. The optimized internal geometry minimizes friction and heat generation.
Precision Engineering: Manufactured to P4 tolerance standards with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal vibration and precise rotational accuracy essential for high-speed applications.
Pre-lubricated Design: Factory-applied lubrication ensures immediate operational readiness and optimal performance throughout the specified temperature range (-30°C to 110°C).
71808 ACD/P4DT Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Instruments: Measuring equipment, optical instruments, and laboratory devices
- High-Speed Motors: Spindle motors, high-frequency motors, and precision drives
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
