71911 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.72 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
52 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
10980 lbf
Radial static load rating
12375 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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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71911 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71911 ACD/P4AQBCC is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This metric system bearing features a moderate preload (Class C) and is supplied as a matched set of four bearings in a back-to-back (QBC) arrangement. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high stability, making it ideal for high-speed, high-rigidity spindles and precision machinery where minimal deflection is critical.
71911 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| QBCC | Quadruplex Back-to-Back arrangement with Moderate Preload (Class C) |
71911 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The quadruplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and moments. The 25° contact angle optimizes axial load carrying capacity.
- High-Speed Performance: The phenolic cage ensures low friction and excellent performance at the high limiting speed of 34,000 rpm, making it suitable for high-speed applications.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore diameter, outside diameter, and width, ensuring precise running accuracy and minimal vibration.
- Optimized Material Selection: Components made from chrome steel provide high hardness and durability, while the phenolic cage offers strength with reduced weight.
- Pre-lubricated & Ready-to-Install: The bearing comes lubricated and pre-configured as a matched set, simplifying installation and ensuring optimal performance from startup.
71911 ACD/P4AQBCC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring maximum rigidity and precision.
- Precision Rotary Tables and indexing heads where accurate angular positioning is critical.
- High-Frequency Machining Spindles in PCB drilling and precision engraving equipment.
- Medical Equipment such as high-speed dental handpieces and surgical drill spindles.
- Advanced Robotics and automation systems requiring high-precision rotary axes.
