71918 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71918 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71918 CEGA/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This single bearing features a 15° contact angle and is manufactured to P4A super-precision tolerance, ensuring minimal runout and vibration. Its core advantages include the ability to handle combined radial and axial loads simultaneously, superior high-speed capability facilitated by a phenolic cage and ceramic balls, and high operational rigidity. It is universally matchable (SU), allowing for precise preload control when paired with a second bearing, making it ideal for high-reliability, high-speed spindles and precision machinery.
71918 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width). |
| C | Specifies a 15° contact angle. |
| E | Indicates optimized internal design for enhanced performance and load capacity. |
| GA | Specifies an Extra light (Class A) preload on a single, universally matchable bearing. |
| HCP4A | Denotes the tolerance class P4A (super precision) and the use of a Phenolic (H) cage. |
71918 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance & Thermal Stability: The combination of a lightweight phenolic resin cage and ceramic balls significantly reduces centrifugal forces and inertial mass, enabling stable operation at the high limiting speed of 15,000 rpm. The phenolic cage also offers excellent dimensional stability across the operating temperature range.
- Superior Rigidity and Accuracy: Manufactured to P4A super-precision tolerances with extremely tight dimensional runouts, this bearing provides exceptional rotational accuracy and system stiffness, which is critical for minimizing deflection under load.
- High Load Capacity: The angular contact design with a 15° contact angle is optimized to support significant combined loads (a dynamic radial load rating of 6,908 lbf and a static rating of 5,400 lbf).
- Universal Matching Capability (SU): As a universally matchable bearing, any two 71918 CEGA/HCP4A bearings can be paired in a duplex set to achieve a specific preload (in this case, Extra Light), simplifying inventory and assembly for high-precision spindle builds.
- Open Seal & Lubrication: The open seal type allows for optimized lubrication schemes tailored to the specific application, reducing friction and heat generation at ultra-high speeds.
71918 CEGA/HCP4A Bearing Typical Application Areas
The 71918 CEGA/HCP4A is designed for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units.
- High-Frequency Motors and Spindles for PCB drilling and semiconductor manufacturing equipment.
