71908 CE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Ball & Washer Dimensions
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71908 CE/HCP4ADBA Bearing Product Overview & Core Advantages
The 71908 CE/HCP4ADBA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set configuration provides superior stability and can accommodate combined loads (radial and axial) simultaneously. Manufactured to a P4A tolerance class and featuring a phenolic cage with ceramic balls, this bearing is engineered for high-speed operation and long service life in precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width) |
| CE | Contact angle of 15° |
| HC | Hybrid ceramic balls (silicon nitride) |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Duplex Back-to-Back arrangement (2 bearings matched) |
| A | Extra light preload |
71908 CE/HCP4ADBA Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Stability: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads, making it ideal for applications requiring high positional accuracy.
Superior High-Speed Capability: The combination of ceramic balls (lower density than steel) and a phenolic cage reduces centrifugal forces, enabling operation at the high limiting speed of 56,000 rpm.
Precision Performance: Manufactured to P4A tolerance class with a consistent 15° contact angle, this bearing ensures minimal runout and vibration for smooth, precise rotation.
Extended Service Life: The hybrid ceramic construction provides excellent wear resistance, reduced thermal expansion, and electrical insulation properties, contributing to longer bearing life in demanding conditions.
71908 CE/HCP4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Robotics: Robot arm joints and CNC rotary tables
- Aerospace Systems: Gyroscopes, navigation instruments, and auxiliary power units
- Medical Equipment: Dental handpieces, high-speed centrifuges, and imaging systems
- Semiconductor Manufacturing: Wafer handling robots and precision positioning stages
