71909 CDTP/HCP4B
Hybrid Ceramic Super Precision Bearings
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71909 CDTP/HCP4B Bearing Product Overview & Core Advantages
The 71909 CDTP/HCP4B is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to accommodate combined loads (radial and axial loads simultaneously), this single bearing features a 15° contact angle optimized for high-speed operation. Its construction with ceramic balls and a phenolic cage significantly reduces centrifugal forces and heat generation, enabling superior performance at the specified limiting speed of 24,000 rpm. Pre-loaded and pre-lubricated, it is ready for installation in high-reliability systems requiring minimal maintenance.
71909 CDTP/HCP4B Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD). |
| C | Specifies a 15° contact angle. |
| DT | Indicates a matched pair of bearings in a tandem arrangement. |
| P | The bearing is supplied with a preload for immediate high rigidity. |
| HC | Denotes Hybrid Ceramic construction (steel rings with ceramic balls). |
| P4 | Specifies the P4 (ABEC-7) tolerance class for ultra-precision. |
71909 CDTP/HCP4B Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls (Silicon Nitride) provides lower density, reduced friction, and superior resistance to wear and thermal expansion compared to steel. This directly contributes to higher limiting speeds, extended service life, and the ability to run with less lubrication.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance at high speeds, further supporting the bearing's high-rotational performance.
- Precision & Rigidity: Manufactured to P4 tolerance class and supplied with a preload, this bearing ensures minimal runout and high system stiffness from the moment of installation, which is critical for precise positioning and dynamic load capacity.
- Optimized Load Capacity: The 15° contact angle is ideal for applications with significant axial loads in combination with radial loads, providing a balanced dynamic load rating of 2925 lbf and static load rating of 2138 lbf.
71909 CDTP/HCP4B Bearing Typical Application Areas
This high-performance precision bearing is ideally suited for demanding applications where speed, accuracy, and reliability are paramount. Key industries and equipment include:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Aerospace Actuators and Control Systems
- Medical and Dental Drill Handpieces
- Semiconductor Manufacturing Equipment
