71818 CD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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71818 CD/P4DGA Bearing Product Overview & Core Advantages
The 71818 CD/P4DGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed capability. As a Universal Matchable (SU) bearing supplied in a matched set of two, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4 tolerance class ensures ultra-precise running, making it ideal for high-rigidity, high-reliability spindles and precision machinery. The phenolic cage and optimized internal geometry contribute to its superior high-speed performance.
71818 CD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71818 | Basic bearing designation, indicating a metric, angular contact bearing with a 90mm bore, 115mm OD, and 26mm width. |
| CD | Indicates a 15° contact angle and Universal Matchable (SU) design. Two bearings can be mounted in a universal arrangement (face-to-face, back-to-back, or tandem) to optimize performance for specific load conditions. |
| P4 | Specifies the tolerance class, corresponding to ISO P4 (ABEC 7) precision. This guarantees extremely tight dimensional and running accuracy for high-precision applications. |
| DGA | Denotes Extra light preload (Class A). A light preload is applied to the bearing set to eliminate internal clearance, enhancing system rigidity and rotational accuracy. |
71818 CD/P4DGA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 15° contact angle is optimized to handle significant combined loads. When used in the specified Universal Matchable (SU) pair, the assembly provides high axial and radial stiffness, crucial for minimizing deflection under load.
Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces and allows for a limiting speed of 15,000 rpm. The optimized internal geometry, including a specific ball quantity (31) and ball diameter (7.144 mm), ensures stable operation at high rotational velocities.
Precision Engineering: Manufactured to P4 tolerance class with tight bore, outside diameter, and width tolerances, this bearing guarantees minimal runout and vibration, which is essential for applications requiring extreme accuracy.
Matched Set Advantage: Supplied as a matched set of two bearings, they are selectively paired to ensure uniform preload and optimal performance when mounted together, simplifying installation and ensuring consistent system behavior.
71818 CD/P4DGA Bearing Typical Application Areas
The 71818 CD/P4DGA is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors and Spindles: Applications requiring rapid acceleration and deceleration.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and other critical rotational systems.
