71904 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71904 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71904 CDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single bearing features an Extra Light (A) preload and P4A tolerance class, ensuring smooth operation with minimal runout. Its 15° contact angle is optimized to handle combined loads efficiently. A key advantage is its Universal Matchable (SU) designation, allowing two bearings to be precisely matched for superior performance in duplex arrangements. The use of ceramic balls and a phenolic cage contributes to its high-speed capability, low friction, and extended service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (9mm width, 20mm bore, 37mm OD). |
| C | 15° nominal contact angle. |
| DG | Universal Matchable (SU) bearing. Two bearings are supplied as a matched set. |
| A | Extra Light preload class. |
| HCP4A | Enhanced tolerance class (P4A) for ultra-precision applications. |
71904 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance class with an Extra Light preload, this bearing provides exceptional rotational accuracy and stiffness, minimizing deflection under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic (Si3N4) balls significantly reduces centrifugal forces, enabling a high limiting speed of 100,000 rpm. This design also reduces heat generation.
- Optimized Load Capacity: The 15° contact angle is engineered to support substantial combined radial and axial loads simultaneously, making it ideal for complex loading conditions.
- Reduced Friction and Long Life: Ceramic balls are harder and smoother than steel, leading to lower friction, reduced wear, and longer service life, especially in high-speed or poorly lubricated environments.
- Pre-lubricated for Immediate Use: The bearing comes pre-lubricated, ensuring optimal performance from the first rotation and simplifying installation.
71904 CDGA/HCP4A Bearing Typical Application Areas
The 71904 CDGA/HCP4A is engineered for high-performance machinery where precision, speed, and reliability are critical. Its primary applications include:
- High-Speed Machine Tool Spindles: For CNC milling, grinding, and drilling centers requiring extreme accuracy and high rotational speeds.
- Precision Robotics: In robot arm joints and actuators where low friction and high rigidity are essential for repeatable positioning.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other instrumentation demanding the highest levels of reliability and performance.
- Medical Equipment: For dental handpieces and surgical drill spindles that operate at very high speeds with minimal vibration.
- High-Frequency Motors and Spindles: Used in applications where a compact, high-speed bearing solution is needed to maximize power density.
