71911 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
0.54 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
39 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
8932 lbf
Radial static load rating
9338 lbf
Limiting speed
46 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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
Price:
$ 331.25
/ each
In Stock
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71911 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71911 ACD/P4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex matched set features a back-to-back (TBT) arrangement, providing superior stability and the ability to withstand combined loads (radial and axial) from both directions. Manufactured to P4A tolerance class with a light preload (Class B), it delivers high running accuracy and is optimized for high-speed operation. The open design and phenolic cage contribute to its performance in precision machinery.
71911 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 ACD/P4ATBTB is decoded as follows:
- 71911: Basic series designation for a high-precision angular contact ball bearing.
- ACD: Contact Angle of 25°. This specific angle optimizes the bearing for carrying combined loads.
- P4A: Tolerance Class. Denotes very high precision levels for dimensional and running accuracy, exceeding ABEC 7 standards.
- TBT: Triplex Back-to-Back. Indicates a set of three bearings matched and arranged in a back-to-back configuration for maximum rigidity and moment load capacity.
- B: Light Preload / Class B. A predefined internal clearance elimination that increases stiffness and improves shaft guidance.
71911 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise alignment under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and three bearing rows, this set offers a high dynamic and static load rating, capable of handling significant radial and bidirectional axial forces simultaneously.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, reducing centrifugal forces and allowing for a high limiting speed. The precision P4A grading minimizes vibration and heat generation at high RPMs.
- Precision Engineering: Manufactured to P4A tolerance standards with a controlled light preload, this bearing ensures minimal runout and consistent, high-accuracy performance in the most demanding applications.
71911 ACD/P4ATBTB Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery where rigidity and accuracy are paramount. Key applications include:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Axes
