71917 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71917 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71917 CD/HCP4ADGA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing is manufactured to P4A tolerance class, ensuring ultra-precise dimensional and running accuracy. Its core advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high rigidity, thanks to its specific 15° contact angle and extra light preload (Class A). The use of a phenolic cage and ceramic balls contributes to superior high-speed performance, low friction, and extended service life, making it ideal for high-reliability machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD). |
| CD | Indicates a 15° contact angle and specific internal design for optimized load distribution. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce weight and friction for higher speeds. |
| P4A | Denotes the tolerance class, specifying very high precision for both dimension and running accuracy. |
| DGA | Specifies Universal Matchable (SU) designation. Two bearings can be paired in a matched set for precise preload and rigidity. |
71917 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a higher limiting speed (17,000 rpm). This construction also offers superior resistance to wear and electrical arcing.
- Phenolic Cage: The phenolic resin cage is lightweight and possesses excellent slip characteristics, further contributing to low friction, smooth operation at high speeds, and resistance to centrifugal forces.
- High Rigidity & Load Capacity: The angular contact design with a 15° contact angle and extra light preload provides high system rigidity, excellent for applications requiring precise shaft positioning. It can support substantial radial dynamic load ratings (17,122 lbf) and static load ratings (21,712 lbf).
- Precision Engineering: Manufactured to P4A tolerance class with tight bearing dimensions and form tolerances, this bearing ensures minimal runout and vibration, which is critical for high-precision spindles.
71917 CD/HCP4ADGA Bearing Typical Application Areas
This high-precision, high-speed bearing is engineered for advanced applications where accuracy, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Instrumentation: High-speed measuring and testing equipment.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
