71911 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71911 ACD/P4ADBC
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
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
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/P4ADBC Bearing Product Overview & Core Advantages
The 71911 ACD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional running accuracy. As part of a matched duplex pair in a back-to-back (DB) arrangement, this bearing is preloaded to deliver superior system stiffness and precise rotational performance. Its P4A tolerance class ensures extremely tight dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and vibration are critical.
71911 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates two single-row bearings supplied as a Duplex set. |
| P4A | High-Precision Tolerance Class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| DBC | Specifics of the Back-to-Back (DB) arrangement and Moderate Preload (Class C). |
71911 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, which is crucial for maintaining precision under heavy combined loads.
- Optimized Load Capacity: With a 25° contact angle, the bearing is engineered to handle significant axial loads in one direction while also supporting substantial radial loads.
- High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 34,000 rpm, making it an excellent high-speed bearing.
- Precision Performance: Manufactured to P4A tolerance class with premium chrome steel components, this bearing guarantees exceptional running accuracy, low noise, and minimal heat generation.
71911 ACD/P4ADBC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, dental handpieces, and other small, high-speed spindles.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Robotic Drives: High-accuracy joints and rotary actuators.
