71905 CE/HCPA9ADGA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71905 CE/HCPA9ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable bearing features a ceramic ball construction and is supplied in a pre-lubricated, universal matchable (SU) set of two. Its primary advantage lies in its ability to handle combined loads with high reliability, making it ideal for high-speed spindles and precision machinery where rigidity and thermal stability are critical.
71905 CE/HCPA9ADGA Bearing Model Code Explained, Specifications & Naming Convention
- 71905: Basic designation indicating a lightweight, high-precision series with a 25mm bore and 42mm outside diameter.
- CE: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial loads.
- HC: Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce friction, heat generation, and allow for higher limiting speeds.
- PA9A: Indicates the Extra Light preload (Class A) and the PA9A tolerance class, ensuring extremely tight dimensional and running accuracy for superior performance.
- DGA: Specifies a Universal Matchable (SU) arrangement. Two bearings are supplied as a set (D) and are ground to universal matching tolerances (GA) for simplified mounting and optimal performance in tandem or back-to-back configurations.
Structural Features and Performance Benefits
This bearing's performance is derived from its advanced material selection and precision engineering:
- Hybrid Ceramic Design: The ceramic balls and steel rings create a hybrid construction that significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds (up to 83,000 rpm).
- High Rigidity and Accuracy: The PA9A tolerance class and controlled preload ensure minimal runout and high system stiffness, which is crucial for machining accuracy and dynamic response.
- Superior High-Speed Capability: The combination of the 15° contact angle, lightweight phenolic cage, and low-density ceramic balls enables exceptional limiting speed performance.
- Universal Matchability: The Universal Matchable (SU) designation means the two bearings in the set are interchangeable and can be mounted in various configurations (back-to-back, face-to-face, or tandem) without pre-selection, simplifying assembly and ensuring consistent performance.
71905 CE/HCPA9ADGA Bearing Typical Application Areas
The 71905 CE/HCPA9ADGA is engineered for high-performance applications where speed, precision, and reliability are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and PCB drilling machines.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace and Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs).
- Medical Equipment: Dental handpieces, high-speed centrifuges, and imaging scanner rotors.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
