71911 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71911 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.36 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 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
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6660 lbf
Radial static load rating
6188 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71911 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71911 ACD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set features an Extra Light (A) preload and adheres to the stringent P4A tolerance class, ensuring superior running accuracy and minimal vibration. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for high-speed, high-precision spindles and machinery where high rigidity and positional stability are critical.
71911 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 ACD/P4ADBA is decoded as follows:
- 71911: Basic bearing series, indicating a light series, 55mm bore, 80mm OD angular contact bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two-bearing) configuration.
- DB: Specifies the Back-to-Back mounting arrangement of the duplex set.
- P4A: Denotes the tolerance class, signifying very high precision levels for dimensional and running accuracy.
- A: Specifies an Extra Light preload applied to the matched set.
71911 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a rigid, moment-resisting bearing system, significantly increasing the overall stiffness of the assembly. This is crucial for applications requiring minimal shaft deflection under load.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support high combined radial and axial loads from both directions efficiently.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class and fitted with a lightweight, robust phenolic cage, this bearing ensures smooth operation, low heat generation, and excellent performance at high rotational speeds, with a limiting speed of 34,000 rpm.
- Optimized for Precision Applications: The Extra Light preload (A) eliminates internal clearance, ensuring precise shaft positioning, reducing noise and vibration, and enhancing system responsiveness.
- Durable Construction: Manufactured from high-grade chrome steel for both rings and balls, ensuring long service life and consistent performance under demanding conditions.
71911 ACD/P4ADBA Bearing Typical Application Areas
This high-precision bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and other high-accuracy machining equipment.
- High-Frequency Motors and Robotic Drives.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
