71908 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71908 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 71908 CD/HCP4ADBA is a precision duplex pair of angular contact ball bearings designed for the most demanding high-performance applications. This matched set in a Back-to-Back (DB) arrangement is preloaded to Extra Light (Class A) specifications, delivering exceptional rotational accuracy and system rigidity. Its use of ceramic balls and a phenolic cage enables superior high-speed performance, reduced friction, and extended service life. This bearing is engineered to handle combined loads and provide unmatched stability in precision spindles and machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD). |
| C | 15° contact angle. |
| D | Duplex bearing pair. |
| HC | Hybrid Ceramic (Silicon Nitride) balls. |
| P4A | High-Precision Tolerance Class (equivalent to ABEC 7). |
| DB | Back-to-Back mounting arrangement. |
| A | Specific preload level: Extra Light / Class A. |
71908 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex Back-to-Back (DB) configuration creates a rigid bearing system that can withstand moment loads and provides excellent operational stability, which is critical for machine tool spindles.
- Superior High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage significantly lowers friction and allows for a very high limiting speed of 41,000 rpm.
- Precision & Accuracy: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and precise shaft positioning, contributing to superior machining finish and accuracy.
- Extended Service Life: Hybrid ceramic construction offers increased durability, electrical resistance, and the ability to operate with minimal lubrication, even at extreme speeds.
- Optimized Preload: The bearings are supplied as a matched set with a pre-applied Extra Light (A) preload, eliminating complex calculations and ensuring immediate, optimal performance upon installation.
71908 CD/HCP4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring high speed, high rigidity, and exceptional accuracy. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-precision joints and arm assemblies.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units.
- Medical Equipment: Dental handpieces and surgical drill motors.
