71921 CD/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
71921 CD/HCP4A Bearing Product Overview & Core Advantages
The 71921 CD/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered to accommodate combined loads, it efficiently handles both radial loads and substantial axial loads in one direction. Its single-row design with a 15° contact angle provides high rigidity and operational stability. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees superior running accuracy, making it an ideal choice for high-speed spindles and other precision machinery where reliability is paramount.
71921 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71921 | Basic bearing designation, indicating the series and dimensions (105mm bore, 145mm OD, 20mm width). |
| C | Designates a 15° contact angle. |
| D | Indicates the bearing is part of a matched arrangement (in this case, supplied as a single bearing for duplex mounting). |
| HC | Signifies the use of Hybrid Ceramic components (Ceramic balls with a steel ring). |
| P4 | Specifies the high-precision tolerance class (equivalent to ABEC-7). |
| A | Denotes that the bearing is supplied with a specific preload. |
71921 CD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This construction enables higher limiting speeds, extended service life, and improved resistance to electrical erosion.
High-Speed Capability: The lightweight phenolic resin cage and optimized internal geometry contribute to lower centrifugal forces and smooth operation at the high limiting speed of 16,000 rpm.
Superior Rigidity and Load Capacity: The angular contact design and P4 precision provide high system rigidity. With a dynamic load rating of 13,905 lbf and a static load rating of 15,638 lbf, it reliably handles significant combined loads.
Pre-Lubricated for Immediate Use: The bearing is factory-lubricated, ensuring optimal performance from the first rotation and simplifying installation.
71921 CD/HCP4A Bearing Typical Application Areas
The 71921 CD/HCP4A is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- High-Frequency Motors and Spindles: Where extreme rotational accuracy and speed are required.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
