S71911 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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S71911 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71911 CDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and speed. Engineered as a single bearing with a universal matchable (SU) designation, it can be mounted in tandem or duplex arrangements with other SU-coded bearings to achieve specific preload and rigidity requirements. Its core advantages include the ability to handle combined radial and axial loads simultaneously, facilitated by a 15° contact angle. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and reduced weight, making it ideal for high-speed spindles and other precision machinery.
S71911 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| 719 | Indicates a high-precision angular contact ball bearing series. |
| 11 | Specifies the bore diameter code (55 mm). |
| C | Designates a 15° contact angle. |
| DG | Stands for a universal matchable bearing, allowing for precise preload control when paired. |
| A | Signifies an Extra light (Class A) preload. |
| HC | Refers to the hybrid ceramic construction (ceramic balls with steel rings). |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7 standards. |
S71911 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces, lowers operating temperature, and enables a higher limiting speed (34,000 rpm). This construction also offers superior resistance to electrical erosion and operates effectively with minimal lubrication.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures stable operation at very high speeds, contributing to the bearing's overall high-speed performance and durability.
- Universal Matchable (SU) Design: This feature allows for simplified mounting of multiple bearings in sets to achieve defined preload and stiffness levels without selective assembly, enhancing rigidity and system accuracy.
- Precision & Rigidity: Manufactured to P4A tolerance class with tight dimensional control on bore, OD, and width, this bearing provides exceptional running accuracy and high rigidity for precise axial and radial positioning.
- Sealed & Pre-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within a specified temperature range.
S71911 CDGA/HCP4A Bearing Typical Application Areas
The S71911 CDGA/HCP4A is ideally suited for high-performance applications where speed, precision, and reliability are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy joints and arm assemblies.
- Medical & Dental Equipment: High-speed handpieces and scanners.
- Aerospace & Defense Systems: Gyroscopes, avionics, and radar systems.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
