71911 ACE/P4AH1DBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 ACE/P4AH1DBA
Basic Information
System of measurement
Metric
Weight
0.34 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
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5355 lbf
Radial static load rating
4500 lbf
Limiting speed
39 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
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71911 ACE/P4AH1DBA Bearing Product Overview & Core Advantages
The 71911 ACE/P4AH1DBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement bearing set is preloaded to Extra light / Class A specifications, ensuring minimal axial and radial play for superior running accuracy. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high stability, making it an ideal choice for high-speed and high-precision spindles. Manufactured to a P4A tolerance class, it guarantees exceptional dimensional and running precision.
71911 ACE/P4AH1DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD). |
| ACE | 25° contact angle, providing a high thrust capacity. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards. |
| H1 | Indicates a specific preload grouping within the "Extra light / Class A" range. |
| DB | Duplex Back-to-Back matched arrangement for high moment rigidity. |
| A | Specifies the preload level as "Extra light / Class A". |
71911 ACE/P4AH1DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing set's resistance to moment loads and enhancing overall system stiffness.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support substantial combined loads, including high axial loads in both directions.
- Superior High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 39,000 rpm. The bearings are pre-lubricated for immediate operation.
- Precision Engineering: Conforming to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures exceptional running accuracy and consistent performance.
- Open Design & Material Quality: The open seal type allows for optimal lubrication flow and heat dissipation. Components are made from high-grade chrome steel for durability and long service life.
71911 ACE/P4AH1DBA Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where precision and speed are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces, laboratory centrifuges.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
