71918 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71918 CB/HCP4A Bearing Product Overview & Core Advantages
The 71918 CB/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. Its primary advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for high-speed spindles and precision machinery. Manufactured to P4 (ABEC-7) tolerance class and featuring a phenolic cage and ceramic balls, this bearing delivers exceptional rotational accuracy, high limiting speed, and extended service life in demanding operational environments.
71918 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71918 | Basic bearing designation | Defines the bearing dimensions: 90mm bore, 125mm OD, 18mm width |
| CB | Specific internal design & contact angle | Indicates a 15° contact angle and optimized internal geometry for high rigidity |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls for reduced friction, higher speed capability, and longer life |
| P4A | Tolerance Class | Corresponds to P4 (ABEC-7) precision grade, ensuring minimal runout and vibration |
71918 CB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This enables higher limiting speeds (26,000 rpm) and provides electrical insulation properties.
High Rigidity & Load Capacity: The 15° contact angle and optimized raceway geometry provide excellent stiffness, making it suitable for applications requiring precise shaft positioning. With a dynamic load rating of 4005 lbf and static load rating of 3960 lbf, it reliably handles significant combined loads.
Precision Phenolic Cage: The phenolic resin cage offers superior strength-to-weight ratio, reduced centrifugal forces, and excellent performance at high speeds, contributing to the bearing's overall high-speed capability.
Precision Manufacturing: Manufactured to P4 tolerance class with tight dimensional control (bore tolerance: -0.008mm to 0), this bearing ensures minimal vibration and superior running accuracy for precision applications.
71918 CB/HCP4A Bearing Typical Application Areas
The 71918 CB/HCP4A is specifically designed for high-performance applications including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles
- Precision Robotics: Robot arm joints, rotary actuators
- Aerospace Systems: Gyroscopes, navigation instruments
- Medical Equipment: Dental handpieces, surgical tools
- High-Speed Motors: CNC spindle motors, high-frequency generators
