71911 ACE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71911 ACE/HCP4ADBA
Basic Information
System of measurement
Metric
Weight
0.29 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
46 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
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
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Product Overview and Core Advantages
The 71911 ACE/HCP4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex back-to-back (DB) matched set features an Extra Light (A) preload and is manufactured to P4A tolerance class, ensuring superior running accuracy and rotational precision. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting substantial radial loads and axial loads in both directions. The combination of a ceramic ball material and a phenolic cage enables outstanding high-speed performance with a limiting speed of 46,000 rpm, making it an ideal choice for high-rigidity, high-reliability spindle arrangements.
71911 ACE/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 ACE/HCP4ADBA is decoded as follows:
- 71911: Basic bearing series, indicating a light series angular contact bearing with a 55mm bore and 80mm outside diameter.
- ACE: Internal design suffix. A denotes Extra Light preload. C indicates a 25° contact angle. E signifies a optimized internal design for high performance.
- HC: Hybrid Ceramic - Denotes the use of ceramic balls, which reduce centrifugal forces, lower operating temperatures, and extend bearing life at high speeds.
- P4A: Precision Tolerance Class - Exceeds ABEC 7/ISO P4 standards, providing extremely tight dimensional and running accuracy for critical applications.
- DB: Duplex Back-to-Back arrangement. This matched pair is configured to provide high moment rigidity and excellent stability under complex loading conditions.
Structural Features and Performance Benefits
- High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior High-Speed Capability: The hybrid ceramic design with silicon nitride balls significantly reduces rolling element mass, minimizing centrifugal forces and enabling stable operation at the high limiting speed of 46,000 rpm. The lightweight phenolic resin cage further enhances high-speed suitability.
- Exceptional Load Capacity: With a 25° contact angle and precision-ground raceways, this bearing set is engineered to handle significant combined radial and axial loads simultaneously.
- Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ready for installation and initial operation, simplifying the mounting process.
- Premium Material Construction: Chrome steel rings provide a hard, durable raceway, while the ceramic balls offer superior wear resistance, electrical insulation, and extended service life.
71911 ACE/HCP4ADBA Bearing Typical Application Areas
This high-precision bearing set is ideally suited for applications where high speed, high rigidity, and extreme accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors and Electric Spindles.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
- Aerospace and Defense instrumentation and gyroscopes.
