71901 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71901 CD/HCP4A Bearing Product Overview & Core Advantages
The 71901 CD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional speed performance. Its defining characteristic is the 15° contact angle, optimized to handle significant axial loads in one direction while supporting radial loads. Manufactured to the stringent P4 (ABEC-7) tolerance class, this bearing ensures minimal runout and vibration, making it ideal for high-reliability, high-speed spindles and precision instruments. The combination of a ceramic ball material and a phenolic cage contributes to lower rotating mass, reduced friction, and superior performance at the specified limiting speed of 130,000 rpm.
71901 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | The basic bearing designation, indicating a high-precision, single-row angular contact bearing with a 12mm bore. |
| CD | Signifies a specific contact angle (15°) and internal design optimized for high rigidity and speed. |
| HC | Indicates the use of Hybrid Ceramic balls, offering advantages in speed, temperature resistance, and longevity. |
| P4A | Denotes the tolerance class P4 (ABEC-7) with specific accuracy requirements for bore and outside diameter. |
71901 CD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The lightweight phenolic resin cage and low-density ceramic (Si3N4) balls drastically reduce centrifugal forces, enabling stable operation at the ultra-high limiting speed of 130,000 rpm.
- Precision & Rigidity: Manufactured to P4 tolerance class, this bearing provides extremely tight dimensional control for superior running accuracy. The 15° contact angle provides excellent axial rigidity.
- Reduced Heat Generation: Ceramic balls have a lower coefficient of thermal expansion and superior smoothness compared to steel, resulting in less friction and lower operating temperatures at high speeds.
- Preload Availability: The bearing is supplied with a preload, which eliminates internal clearance to enhance system stiffness and rotational accuracy, which is critical for machine tool spindles.
71901 CD/HCP4A Bearing Typical Application Areas
- High-Frequency CNC Spindles for milling, drilling, and grinding
- Precision Instrumentation and measuring equipment
- High-Speed Machining Centers
- Dental and Medical Handpiece Drives
- Aerospace Gyroscopes and Navigation Systems
