71821 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71821 ACD/P4DGB
Basic Information
System of measurement
Metric
Weight
0.64 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
35
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7898 lbf
Radial static load rating
12825 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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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71821 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71821 ACD/P4DGB is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4 tolerance class, this bearing excels in high-speed operations with a limiting speed of 16,000 rpm. Its universal matchable (SU) design allows two bearings to be mounted in a versatile arrangement to support combined loads, handling significant radial and axial forces simultaneously. The phenolic cage and light preload (Class B) contribute to smooth, quiet operation and low heat generation, making it ideal for high-precision, high-rigidity applications.
71821 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| ACD | 25° Contact Angle, Universal Matchable Design | Optimized for combined loads; allows flexible mounting configurations (back-to-back, face-to-face, or tandem) to suit specific application requirements. |
| P4 | High Precision Tolerance Class | Ensures extremely tight dimensional and running accuracy for applications requiring minimal runout and vibration. |
| DGB | Light Preload (Class B), Universal Matchable Pair | Reduces axial and radial play, increasing system rigidity without generating excessive heat, ideal for high-speed spindles. |
71821 ACD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and universal matchable pairing enable the bearing to support substantial combined radial and axial loads. The light preload eliminates internal clearance, resulting in superior system stiffness.
- High-Speed Performance: The lightweight phenolic cage ensures stability and reduced centrifugal forces at high speeds, contributing to the high limiting speed of 16,000 rpm. The open design facilitates efficient lubrication management.
- Precision Engineering: Manufactured to P4 tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing guarantees exceptional running accuracy for demanding applications.
- Durable Construction: Made from chrome steel for both rings and balls, the bearing offers high fatigue resistance and long service life under demanding operating conditions.
71821 ACD/P4DGB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring precision and rigidity.
- Precision Grinding Spindles: Applications where minimal runout and high rotational accuracy are critical.
- High-Frequency Motors: Motors operating at very high rotational speeds.
- Industrial Pumps & Compressors: For shafts subjected to combined radial and axial loads.
- Aerospace & Defense Systems: Precision gimbals, navigation systems, and other high-reliability rotating assemblies.
