71908 CDTP/HCP4B
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71908 CDTP/HCP4B Bearing Product Overview & Core Advantages
The 71908 CDTP/HCP4B is a single-row angular contact ball bearing engineered for high-precision and high-speed applications. Its defining characteristic is the 15° contact angle, optimized to support significant combined loads—primarily radial loads with accompanying axial loads in one direction. Manufactured to the exacting P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy. The combination of a ceramic ball and phenolic cage contributes to lower friction, higher limiting speeds, and reduced weight, making it an ideal solution for demanding, high-rotational-speed machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Standard bearing series designation, indicating a metric, single-row angular contact bearing with a 40mm bore. |
| C | Specifies a 15° contact angle, optimized for high-speed operation. |
| DT | Indicates a matched set of two bearings for duplex mounting. |
| P | Signifies that the bearing is supplied with a specific preload for enhanced rigidity. |
| HC | Denotes the use of Hybrid Ceramic balls (ceramic balls with steel rings). |
| P4 | Specifies the P4 tolerance class (ABEC-7), indicating ultra-precision manufacturing standards. |
71908 CDTP/HCP4B Bearing Structural Features & Performance Benefits
High-Speed & Low-Friction Performance: The hybrid ceramic construction with silicon nitride balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 26,000 rpm. This design minimizes heat generation and is suitable for applications where lubrication is limited.
High Rigidity & Precision: The bearing is supplied with a preload, which eliminates internal clearance and increases system stiffness. This is critical for applications requiring minimal shaft deflection and high positional accuracy. The P4 precision grade ensures smooth, quiet, and vibration-free operation.
Superior Load Capacity: The 15° contact angle and optimized internal geometry provide an excellent balance between radial and axial load carrying capacity, with a dynamic load rating of 2790 lbf and a static load rating of 1912 lbf.
Wide Operating Range: The open seal type allows for custom lubrication schemes, while the specified materials support a temperature range from -30°C to 110°C.
71908 CDTP/HCP4B Bearing Typical Application Areas
The 71908 CDTP/HCP4B is designed for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units.
- High-Speed Motors and Drives: Spindles for PCB drilling and dental handpieces.
- Test and Measurement Equipment: Requiring minimal runout and high rotational accuracy.
