71820 CD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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71820 CD/P4DGA Bearing Product Overview & Core Advantages
The 71820 CD/P4DGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined radial and axial loads simultaneously. Its P4 tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized internal geometry contribute to smooth operation at high rotational speeds.
71820 CD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation, indicating a metric, angular contact bearing with a 100mm bore, 125mm OD, and 26mm width. |
| CD | Specifies a 15° contact angle and indicates the bearing is part of a universally matchable (SU) pair. This allows for flexible mounting arrangements (back-to-back, face-to-face, or tandem) to suit different load and rigidity requirements. |
| P4 | Denotes the tolerance class, signifying very high precision in bore, outer diameter, and width dimensions, as well as running accuracy. |
| DGA | Indicates the bearing is lubricated and comes with an extra light preload (Class A). This preload eliminates internal clearance, enhancing system rigidity and rotational accuracy from start-up. |
71820 CD/P4DGA Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The 15° contact angle and universal matchable (SU) design, when mounted in pairs, create a highly rigid bearing system capable of withstanding complex combined loads. The P4 tolerance class guarantees minimal runout and vibration, which is critical for high-precision applications.
Optimized for High-Speed Operation: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and allows for a limiting speed of 15,000 rpm. The open design and factory-applied lubrication facilitate efficient heat dissipation.
Superior Load Capacity: With a dynamic load rating of 8348 lbf and a static load rating of 13162 lbf, this bearing is built to handle significant radial and axial forces, ensuring long-term reliability and durability in demanding conditions.
71820 CD/P4DGA Bearing Typical Application Areas
The 71820 CD/P4DGA is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: CNC rotary tables, indexing heads, and robotic arms.
- High-Frequency Motors and Spindles: Where minimal vibration and high running accuracy are required.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments.
