71818 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71818 ACD/P4DGB
Basic Information
System of measurement
Metric
Weight
0.56 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
115 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
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
11250 lbf
Limiting speed
15 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
No drawings available at the moment, will be launched soon
In Stock
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71818 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71818 ACD/P4DGB is a metric precision angular contact ball bearing designed for applications demanding high rotational accuracy and rigidity. As a Universal Matchable (SU) bearing supplied in a pre-loaded duplex set, it is engineered to accommodate combined loads—significant radial and axial loads in one direction—simultaneously. Its P4 tolerance class ensures exceptional running accuracy, making it ideal for high-speed spindles and other precision machinery where superior performance and reliability are critical.
71818 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Contact Angle of 25°. Optimized for high axial load capacity. |
| P4 | High precision tolerance class, offering extremely tight dimensional and running accuracy. |
| DGB | Indicates a Universal Matchable (SU) duplex set with a Light preload (Class B). The two bearings are supplied as a matched pair for immediate installation. |
71818 ACD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex set configuration provides significantly increased system rigidity, enabling the bearing to handle heavy combined loads effectively. The 25° contact angle is specifically optimized for high axial load carrying capability.
- High-Speed Performance: The lightweight phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to the high limiting speed of 15,000 rpm. This makes it suitable for demanding high-speed applications.
- Precision Engineering: Manufactured to P4 tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This results in minimal runout and superior rotational accuracy for precision equipment.
- Ready-to-Install Matched Set: As a Universal Matchable (SU) pair with a defined light preload, the set is supplied ready for installation, eliminating complex mounting calculations and ensuring consistent, optimal performance from the start.
71818 ACD/P4DGB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace Control Systems
