71806 ACD/P4DFB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71806 ACD/P4DFB
Basic Information
System of measurement
Metric
Weight
0.052 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
1598 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71806 ACD/P4DFB Bearing Product Overview & Core Advantages
The 71806 ACD/P4DFB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex face-to-face (DF) matched set is preloaded to Light / Class B specifications, ensuring minimal axial and radial play for superior system stability. Its key advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it ideal for high-precision, high-rigidity spindles and machinery. Manufactured to a P4 tolerance class, it guarantees outstanding running accuracy and consistent performance.
71806 ACD/P4DFB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71806 | Basic bearing series and size designation (30mm bore, 42mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings supplied as a matched set). |
| P4 | High precision tolerance class, superior to ABEC-7. |
| DF | Matched arrangement: Face-to-Face (DF). This configuration provides high moment rigidity and accommodates axial loads from both directions. |
| B | Specifies the Light preload (Class B) applied to the matched set. |
71806 ACD/P4DFB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex face-to-face (DF) arrangement creates a highly rigid bearing system capable of withstanding complex combined loads and moments. The 25° contact angle is optimized for supporting significant axial loads.
- Precision Performance: Manufactured to P4 tolerance standards with a phenolic cage, this bearing ensures extremely low vibration, smooth operation, and precise rotational accuracy, which is critical for high-speed applications.
- Optimized for High Speeds: The lightweight phenolic cage and open design, combined with the light preload, contribute to a high limiting speed of 100,500 rpm, reducing centrifugal forces and operational temperature.
- Durability & Reliability: Constructed from chrome steel for both rings and balls, the bearing offers excellent wear resistance and long service life under demanding conditions.
71806 ACD/P4DFB Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and laboratory automation systems.
- Aerospace & Defense: Gyroscopes, navigation systems, and radar equipment.
