71909 CB/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
71909 CB/HCP4A Bearing Product Overview & Core Advantages
The 71909 CB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. This metric-series bearing features a 15° contact angle and P4 (ABEC-7) tolerance class for superior running precision. Its core advantages include the ability to accommodate combined radial and axial loads in one direction, optimized for high-speed operation up to 50,000 rpm, and delivered with preload for immediate high rigidity and minimal axial/radial play. The combination of ceramic balls and phenolic cage significantly reduces centrifugal forces and heat generation, making it ideal for demanding, high-velocity scenarios.
71909 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD, 12mm width). |
| C | Designates a 15° contact angle. |
| B | Indicates the bearing is supplied with a preload for high rigidity. |
| HC | Refers to the Hybrid Ceramic construction (steel rings with ceramic balls). |
| P4 | Specifies the high-precision tolerance class (equivalent to ABEC-7). |
| A | Denotes a specific internal geometry and accuracy level within the P4 class. |
71909 CB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of silicon nitride (Si3N4) ceramic balls within chrome steel rings results in up to 60% lower density than steel. This drastically reduces centrifugal loading, enabling higher limiting speeds (50,000 rpm), lower operating temperatures, and extended service life.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction at high speeds, contributing to smooth operation and reduced vibration.
- Preloaded Configuration: Supplied with preload, this bearing achieves immediate high system rigidity, improved rotational accuracy, and resistance to operational vibrations right from installation.
- High-Precision Grinding: Manufactured to P4 tolerance class, the bearing ensures minimal runout and precise shaft positioning, which is critical for applications demanding extreme accuracy.
- Optimized Lubrication: The bearing comes pre-lubricated with a high-performance grease suitable for its specified temperature range (-30°C to 110°C), ensuring immediate readiness and reliable initial operation.
71909 CB/HCP4A Bearing Typical Application Areas
The 71909 CB/HCP4A is specifically designed for high-performance machinery where speed, precision, and rigidity are paramount. Key application areas include:
- High-Speed Machine Tool Spindles: For CNC milling, grinding, and drilling centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
