71821 ACD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71821 ACD/P4DGA
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
Extra light / Class A
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/P4DGA Bearing Product Overview & Core Advantages
The 71821 ACD/P4DGA is a high-precision, universally matchable double row angular contact ball bearing engineered for demanding applications. Its core advantage lies in its ability to accommodate combined radial and axial loads simultaneously, providing exceptional rotational accuracy and system rigidity. Manufactured to a P4 tolerance class and featuring an extra light preload (Class A), this bearing is optimized for high-speed operation and precise positioning in compact installations, ensuring superior performance and long-term reliability.
71821 ACD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| 71821 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Double row configuration for high rigidity and load capacity. |
| P4 | Indicates a high-precision tolerance class for applications requiring extreme running accuracy. |
| DGA | Universal Matchable (SU) designation. Two bearings are universally matchable in any combination (face-to-face, back-to-back, or tandem) without pre-set preload, offering exceptional mounting flexibility. |
71821 ACD/P4DGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides superior radial and axial stiffness, enabling the bearing to handle significant combined loads from multiple directions, which is critical for maintaining precision under operational stresses.
- Precision & Speed Performance: Built to P4 tolerance standards with an extra light preload, this bearing minimizes vibration and heat generation, allowing for a high limiting speed of 16,000 rpm. The phenolic cage contributes to smooth operation at high velocities.
- Universal Matching Capability (SU): The DGA suffix signifies that bearings are universally matchable. This allows for flexible arrangement of two bearings to achieve specific preload and stiffness characteristics post-mounting, simplifying inventory and enhancing application versatility.
- Material & Construction: Manufactured from high-grade chrome steel for rings and balls, ensuring durability and wear resistance. The open design is supplied lubricated and is suitable for a standard operating temperature range.
71821 ACD/P4DGA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery requiring precision and speed, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Drives and Precision Positioning Systems
