71905 CEGA/P4A
71900 Series Super Precision Angular Contact Ball 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 CEGA/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a single bearing with an extra light preload (Class A), it delivers smooth, low-friction operation and precise shaft positioning. Its P4A tolerance class ensures superior dimensional and running accuracy, making it ideal for high-speed spindles and precision machinery where minimal runout and vibration are critical. The bearing is universally matchable (SU), allowing for precise axial play adjustment when mounted with a second, identical bearing.
71905 CEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation indicating a metric, angular contact ball bearing with a 25 mm bore, 42 mm OD, and 9 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed applications with combined radial and axial loads. |
| E | Indicates an optimized internal design, often featuring a larger ball complement and reinforced structure for increased load capacity. |
| GA | Denotes a specific preload group: Extra light preload (Class A) for minimal friction and heat generation. |
| P4A | Identifies the tolerance class, signifying very high precision levels for both dimensional and running accuracy. |
Structural Features and Performance Benefits
- High-Speed Capability: The combination of a 15° contact angle and a lightweight phenolic resin cage enables stable operation at high rotational speeds, with a limiting speed of 83,000 rpm.
- Superior Rigidity and Accuracy: Manufactured to P4A precision tolerances with an extra light preload, this bearing provides excellent shaft rigidity and minimizes axial and radial play, ensuring high running accuracy.
- Optimized Load Capacity: The "E"-type design incorporates a full complement of 16 precision balls, enhancing the dynamic and static load ratings (1186 lbf dynamic, 630 lbf static) for reliable performance under combined loads.
- Universal Matching: As a Universal Matchable (SU) bearing, it can be paired with an identical bearing to create a precisely controlled duplex set, simplifying assembly and improving system performance.
- Material Quality: Components made from high-grade chrome steel ensure high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
71905 CEGA/P4A Bearing Typical Application Areas
The 71905 CEGA/P4A is engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instruments: Measuring devices, optical scanners, and laboratory equipment.
- High-Speed Motors and Drives: Servo motors, spindle drives, and robotics.
- Aerospace and Defense Systems: Gyroscopes, navigation systems, and auxiliary power units.
