71918 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71918 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71918 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 15° contact angle is optimized to support combined loads, effectively carrying significant thrust loads in one direction alongside radial loads. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it an ideal solution for demanding, high-speed machinery.
Model Code Breakdown
- 71918: Basic bearing series, indicating a light series, single-row angular contact ball bearing with a 90mm bore and 125mm outside diameter.
- C: Signifies a 15° contact angle.
- DG: Indicates the bearing is Universal Matchable (SU) and can be mounted in tandem, back-to-back, or face-to-face arrangements with other universal match bearings to achieve specific preload and stiffness characteristics.
- A: Denotes a specific Extra light preload (Class A) applied to the bearing.
- HCP4A: Defines the tolerance class. "HC" may refer to a hybrid ceramic design, and P4A specifies very high dimensional and running accuracy standards, exceeding ABEC 7/ISO Class 4.
71918 CDGA/HCP4A Bearing Structural Features & Performance Benefits
The performance of the 71918 CDGA/HCP4A is a direct result of its advanced material selection and precision engineering. The hybrid ceramic construction, featuring chrome steel rings and silicon nitride (Si3N4) ceramic balls, provides significant advantages including reduced operating temperature, higher limiting speed (15,000 rpm), and electrical insulation. The lightweight phenolic resin cage ensures excellent guidance and stability at high velocities. The P4A super-precision tolerance guarantees minimal runout and vibration, which is critical for applications requiring high positional accuracy. The extra light preload (Class A) minimizes deflection under load, enhancing system rigidity without significantly increasing torque or heat generation.
71918 CDGA/HCP4A Bearing Typical Application Areas
This high-precision angular contact bearing is specifically designed for the most demanding applications across various industries:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors and Robotic Drives.
- Medical Equipment: Dental handpieces, imaging scanners.
- Aerospace & Defense Systems: Gyroscopes, radar equipment.
