71811 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71811 ACD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.16 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3510 lbf
Radial static load rating
4590 lbf
Limiting speed
34 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71811 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71811 ACD/P4DBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a matched duplex pair in a back-to-back (DB) arrangement, this bearing is pre-configured to provide superior stability and can accommodate combined radial and axial loads. Manufactured to a P4 tolerance class and featuring an extra light preload (Class A), it is engineered for high-speed operation up to 34,000 rpm, making it an ideal solution for high-precision, high-reliability machinery.
71811 ACD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71811 ACD/P4DBA provides detailed technical specifications:
- 71811: The basic bearing designation, indicating a metric, angular contact bearing with a 55mm bore.
- AC: Signifies Angular Contact design with a 25° contact angle.
- D: Indicates the bearing is one of a Duplex pair.
- P4: Denotes a high-precision tolerance class for exceptional running accuracy.
- DB: Specifies the Duplex Back-to-Back mounting arrangement, which provides high rigidity against moment loads.
- A: Identifies the Extra Light Preload (Class A) applied to the matched set.
71811 ACD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The back-to-back duplex arrangement (DB) creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and ensuring exceptional operational stiffness.
- Superior Precision: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for maintaining precision in high-speed spindles.
- Optimized High-Speed Performance: The combination of a phenolic resin cage, a 25° contact angle, and an extra light preload minimizes friction and heat generation, enabling reliable operation at the high limiting speed of 34,000 rpm.
- Robust Load Capacity: The design efficiently handles combined radial and axial loads, with a dynamic load rating of 3510 lbf and a static load rating of 4590 lbf.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability and long service life under demanding conditions.
71811 ACD/P4DBA Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Advanced Robotics and Automation Equipment
