71808 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71808 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71808 ACD/P4DGB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-lubricated, light preload (Class B) configuration, it delivers outstanding performance in high-speed operations. Its P4 tolerance class ensures superior dimensional and running accuracy, making it ideal for machine tool spindles and other precision machinery where high rigidity and reliable operation under combined loads are critical.
71808 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing designation indicating the bearing size (40mm bore, 52mm OD, 14mm width) |
| ACD | Angular Contact Design with 25° contact angle, optimized for high-speed performance |
| P4 | Precision tolerance class superior to ABEC-7, ensuring minimal runout and vibration |
| DGB | Universal Matchable (SU) arrangement - bearings can be paired in any combination to achieve required preload |
71808 ACD/P4DGB Bearing Structural Features & Performance Benefits
High-Speed Capability: The phenolic cage and optimized 25° contact angle enable stable operation at limiting speeds up to 56,000 rpm, making it an exceptional high-speed bearing solution.
Superior Load Capacity: With a radial dynamic load rating of 1667 lbf and static rating of 2059 lbf, this bearing effectively handles combined radial and axial loads simultaneously.
Precision Engineering: Manufactured to P4 tolerance standards with tight dimensional controls (±0.004mm on diameters), ensuring minimal vibration and precise positioning in critical applications.
Universal Matching Design: The SU arrangement allows for flexible bearing pairing without selective matching, simplifying installation and maintenance while maintaining consistent high rigidity performance.
71808 ACD/P4DGB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding spindles requiring exceptional accuracy and speed
- High-Speed Motors: Precision electric motors and spindle drives operating at elevated rotational speeds
- Precision Instrumentation: Medical equipment, optical instruments, and measuring devices demanding minimal runout
- Robotics and Automation: High-accuracy robotic joints and positioning systems requiring reliable angular contact bearing performance
- Aerospace Components: Guidance systems and auxiliary equipment where precision and reliability are paramount
