71804 ACDGC/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71804 ACDGC/P4
Basic Information
System of measurement
Metric
Weight
0.018 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
32 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
17
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
819 lbf
Radial static load rating
562 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71804 ACDGC/P4 Bearing Product Overview & Core Advantages
The 71804 ACDGC/P4 is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. Engineered to a P4 tolerance class, this bearing excels in scenarios where superior running accuracy is paramount. Its key advantage lies in its ability to accommodate combined loads—simultaneously handling significant radial and axial forces. The moderate preload (Class C) ensures optimal stiffness and minimizes deflection under operational stresses, making it an ideal choice for high-speed spindles and precision machinery where high rigidity and dimensional stability are critical.
71804 ACDGC/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series and size designation (20mm bore, 32mm OD, 7mm width). |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| DG | Universal Matchable (SU) bearing, supplied in a set of 3 for precise preload arrangement. |
| C | Specifies a Moderate preload (Class C) for enhanced system rigidity. |
| P4 | Indicates a high-precision tolerance class, exceeding standard ABEC-7 specifications. |
71804 ACDGC/P4 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and phenolic resin cage work in concert to provide exceptional stiffness. This enables the bearing to effectively manage combined radial and axial loads, with a dynamic load rating of 819 lbf and a static load rating of 562 lbf.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 121,000 rpm. The optimized internal geometry and 25° contact angle ensure stable operation at high rotational velocities.
- Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on the bore, outside diameter, and width. This results in minimal runout and superior rotational accuracy for critical applications.
- Universal Matching: As a Universal Matchable (SU) bearing supplied in a set, it allows for flexible mounting configurations (DB, DF, DT) to achieve the desired preload and stiffness without selective assembly.
71804 ACDGC/P4 Bearing Typical Application Areas
This precision bearing is engineered for high-performance machinery where accuracy and speed are non-negotiable. Key application fields include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, dental handpieces, and small precision motors.
- High-Frequency Motors: Spindles for routers and other high-RPM equipment.
- Robotics: Joints and actuators requiring high rigidity and precision.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments.
