71820 CD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71820 CD/P4DGC
Basic Information
System of measurement
Metric
Weight
0.62 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
34
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8348 lbf
Radial static load rating
13162 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71820 CD/P4DGC Bearing Product Overview & Core Advantages
The 71820 CD/P4DGC is a precision angular contact ball bearing designed for applications demanding high rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-loaded pair, it excels at handling combined loads—simultaneously supporting substantial radial loads and axial loads in one direction. Its P4 tolerance class ensures exceptional dimensional 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 the specified limiting speed.
71820 CD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a universal matchable bearing designed with a specific contact angle and internal clearance for pairing. Two bearings can be mounted in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to achieve the required rigidity and load capacity. |
| P4 | Denotes a high-precision tolerance class per ISO standards. This ensures very tight limits on bore diameter, outside diameter, and width, as well as superior running accuracy for applications requiring minimal vibration and high-speed performance. |
| DGC | Signifies a Moderate preload / Class C. This preload eliminates internal clearance, increasing bearing rigidity and shaft positioning accuracy, which is critical for minimizing deflection under load in precision applications. |
71820 CD/P4DGC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 15° contact angle and universal matchable (SU) design allow two bearings to be paired, creating a highly rigid system capable of supporting significant combined radial and axial loads.
- Precision High-Speed Operation: The lightweight phenolic resin cage ensures stability and low friction at high speeds, contributing to the bearing's high limiting speed. The P4 tolerance is fundamental to smooth, vibration-free running.
- Optimized Internal Geometry: Manufactured from chrome steel for both rings and balls, the bearing features precisely sized and spaced balls to distribute loads evenly and ensure consistent performance.
- Ready-to-Install Matched Set: Supplied as a lubricated and pre-loaded pair, this bearing set simplifies installation and ensures immediate, optimal performance without the need for initial adjustment.
71820 CD/P4DGC Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: For milling, grinding, and turning centers where high speed, precision, and rigidity are paramount.
- Precision Grinding Spindles: Where extreme running accuracy and minimal runout are required.
- High-Frequency Motors: Used in spindles for PCB drilling and other high-speed automation equipment.
- Medical and Laboratory Equipment: In devices requiring reliable, high-speed rotary motion.
