71820 ACD/P4DBG90
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71820 ACD/P4DBG90
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
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
34
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7762 lbf
Radial static load rating
12375 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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
Price available upon request.
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71820 ACD/P4DBG90 Bearing Product Overview & Core Advantages
The 71820 ACD/P4DBG90 is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement is pre-loaded at the factory, providing superior stiffness and enabling it to handle combined loads—significant radial and bidirectional axial loads simultaneously. Manufactured to P4 tolerance class, it guarantees high running accuracy and is ideal for high-speed, high-reliability machinery where precise shaft positioning is critical.
71820 ACD/P4DBG90 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation, indicating a 100mm bore, 125mm OD, and 26mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings in a set). |
| P4 | High precision tolerance class for superior running accuracy. |
| DB | Back-to-Back mounting arrangement, providing high moment rigidity. |
| G90 | Specific preload level applied to the bearing set. |
71820 ACD/P4DBG90 Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex back-to-back (DB) configuration with factory-applied preload eliminates internal clearance, resulting in extremely high system stiffness and minimal axial/radial deflection under load.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support substantial combined loads—high radial loads and thrust loads in both directions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel components contribute to smooth operation at the limiting speed of 15,000 rpm.
- Precision & Longevity: Manufactured to P4 tolerance standards with tight dimensional control on bore diameter, outside diameter, and width, ensuring consistent performance, low vibration, and extended service life.
71820 ACD/P4DBG90 Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Spindles for PCB drilling and routing
- Precision Gearboxes and transmission systems
- Industrial Pumps and compressors
- Robotic Arm Joints and precision automation equipment
