71817 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71817 ACD/P4DGB
Basic Information
System of measurement
Metric
Weight
0.53 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
110 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
30
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
10800 lbf
Limiting speed
28 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
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71817 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71817 ACD/P4DGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial loads in one direction. Its P4 tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The light preload (Class B) minimizes deflection under operational forces, enhancing system stiffness and positioning accuracy from startup.
71817 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71817 | Basic bearing series and size designation (85mm bore, 110mm OD, 26mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is supplied as a Universal Matchable (SU) pair. Two bearings can be arranged in tandem, back-to-back, or face-to-face configurations. |
| P4 | Indicates a high-precision tolerance class, superior to standard ABEC-7, for applications requiring extreme running accuracy. |
| DGB | The pair is pre-set with a Light Preload (Class B) for immediate high rigidity and optimal performance upon installation. |
71817 ACD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design with a 25° contact angle and the use of a matched pair create a system with very high rigidity, capable of supporting substantial combined radial and axial loads.
- Precision High-Speed Performance: The P4 tolerance and lightweight phenolic cage contribute to smooth operation, reduced vibration, and a high limiting speed of 28,000 rpm, making it an excellent high-speed bearing.
- Optimized Universal Matching: The Universal Matchable (SU) feature provides design flexibility, allowing the two bearings to be mounted in various configurations (Back-to-Back, Face-to-Face, Tandem) to best suit the load and stiffness requirements of the application.
- Superior Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
71817 ACD/P4DGB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motors.
- Industrial Pumps and Compressors: Where high axial and radial load capacity is critical.
- Robotics and Automation: High-accuracy rotary joints and arm axes.
