71938 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71938 CD/HCP4A Bearing Product Overview & Core Advantages
The 71938 CD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing, it is optimized to support high combined loads, handling significant radial loads and unidirectional axial loads simultaneously. Its defining features include a P4 (ABEC-7) tolerance class for superior running accuracy, a ceramic ball and phenolic cage construction for high-speed capability, and the availability of preload for enhanced system stiffness. This configuration makes it ideal for high-performance, high-reliability machinery where precision and speed are critical.
71938 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing series and size designation (190mm bore, 260mm OD). |
| C | Specifies a 15° contact angle, optimized for high-speed operation. |
| D | Indicates the bearing is supplied with a preload for increased rigidity. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4 | Denotes a super-precision tolerance class (ABEC-7 equivalent). |
71938 CD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & High-Rigidity Design: The combination of a 15° contact angle and the availability of preload provides exceptional system stiffness, minimizing deflection under load. The hybrid ceramic balls significantly reduce centrifugal forces and friction, enabling a high limiting speed of 9,000 rpm.
- Superior Load Capacity: With a dynamic load rating of 38,700 lbf and a static load rating of 49,500 lbf, this bearing is built to handle demanding combined radial and axial loads in one direction.
- Optimized for Precision: Manufactured to P4 tolerance, it ensures minimal runout and vibration, which is critical for applications requiring extreme positional accuracy.
- Advanced Material Composition: The phenolic resin cage offers excellent strength-to-weight ratio and operates smoothly at high speeds, while the ceramic balls provide electrical insulation, reduced wear, and extended service life.
71938 CD/HCP4A Bearing Typical Application Areas
- 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-Speed Motors and Drives: Spindles for PCB drilling and semiconductor manufacturing equipment.
