71918 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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71918 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71918 CD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and speed. Engineered as a universally matchable (SU) pair, it enables simplified installation and optimal performance in preloaded configurations. Its core advantages include the ability to handle combined loads (radial and axial) simultaneously, superior high-speed capability facilitated by a phenolic cage and ceramic balls, and outstanding operational precision guaranteed by its P4A tolerance class. This bearing is the ideal choice for high-reliability, high-rigidity spindle systems.
71918 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71918 | Basic bearing series and size designation. | Indicates a metric, high-precision angular contact bearing with a 90mm bore, 125mm OD, and 36mm width. |
| CD | Contact angle of 15° and universal matchable design. | Optimized for high-speed operation and allows two bearings to be paired in a universal matchable (SU) arrangement for simplified mounting and preload control. |
| HC | Hybrid Ceramic construction. | Features ceramic balls, which reduce centrifugal forces, lower operating temperature, and extend bearing life, especially at high speeds. |
| P4A | Tolerance class. | Denotes a super-precision bearing with extremely tight dimensional and running accuracy tolerances, surpassing ABEC 7/ISO P4 standards. |
| DGA | Preload designation: Extra Light (Class A). | Specifies the internal preload level, ideal for very high-speed applications where minimal friction and heat generation are critical. |
71918 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of silicon nitride (Si3N4) ceramic balls significantly reduces weight and inertia, enabling higher limiting speeds (15,000 rpm) and providing non-conductive properties. This construction offers superior resistance to wear and thermal degradation.
Phenolic Resin Cage (Retainer): The lightweight and robust phenolic cage ensures excellent dimensional stability and guidance at high rotational speeds, contributing to smooth operation and reduced vibration.
Universal Matchable (SU) Design: This feature allows any two CD-designated bearings to be mounted together without selective matching. This simplifies inventory management and assembly while ensuring precise preload and high rigidity in the final application.
Super-Precision P4A Tolerances: With bore and outside diameter tolerances of -0.004mm to 0, this bearing guarantees exceptional running accuracy, minimal runout, and consistent performance in the most demanding precision machinery.
71918 CD/HCP4ADGA Bearing Typical Application Areas
The 71918 CD/HCP4ADGA is engineered for high-performance applications where speed, accuracy, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Advanced Instrumentation: Semiconductor manufacturing and metrology equipment.
