71917 ACB/HCP4A
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
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71917 ACB/HCP4A Bearing Product Overview & Core Advantages
The 71917 ACB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Positioned in the P4 (ABEC-7) tolerance class, this bearing is designed to handle significant combined loads (radial and axial) simultaneously, with a contact angle of 25° optimizing axial load capacity. Its construction with a ceramic ball and phenolic cage enables superior high-speed performance and reduced rotational mass, making it ideal for demanding, high-RPM machinery where thermal stability and minimal vibration are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD, 18mm width) |
| ACB | Angular Contact Bearing design with a 25° contact angle |
| HCP4A | Hybrid Ceramic (Silicon Nitride) balls and P4A (ABEC-7) precision tolerance with preload |
71917 ACB/HCP4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The combination of ceramic balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and inertial mass, allowing for a high limiting speed of 24,000 rpm. This hybrid construction also provides superior resistance to thermal expansion at high rotational velocities.
High Rigidity & Precision: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration. The 25° contact angle and optimized internal geometry deliver high system rigidity, crucial for maintaining accuracy under combined radial and axial loads.
Preload & Matched Arrangement: The bearing is supplied with a preload, which eliminates internal clearance and increases stiffness. As a single bearing in a matched arrangement, it simplifies installation while providing precise axial positioning.
Optimized Lubrication: The bearing comes pre-lubricated for immediate operation within a wide temperature range of -30°C to 110°C, ensuring reliable performance from startup.
71917 ACB/HCP4A Bearing Typical Application Areas
The 71917 ACB/HCP4A is ideally suited for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs).
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
