71911 ACE/HCPA9ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71911 ACE/HCPA9ADGA
Basic Information
System of measurement
Metric
Weight
0.29 kg
Tolerance class
PA9A
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
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71911 ACE/HCPA9ADGA Bearing Product Overview & Core Advantages
The 71911 ACE/HCPA9ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional speed and rigidity. This universal matchable (SU) bearing is designed to accommodate combined loads (radial and axial) simultaneously. Its key advantages include superior high-speed performance enabled by a phenolic cage and ceramic balls, and extra light preload (Class A) for minimal friction and precise operation. The compact design, with a 55 mm bore and 80 mm outside diameter, makes it ideal for high-reliability, space-constrained installations.
71911 ACE/HCPA9ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 ACE/HCPA9ADGA is decoded as follows:
- 71911: Basic bearing series, indicating a high-precision angular contact bearing with a 55 mm bore and 80 mm outside diameter.
- ACE: Denotes specific internal design features, including a 25° contact angle and enhanced internal geometry for optimal performance.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- PA9A: Indicates an ultra-high precision tolerance class (PA9A), exceeding standard ABEC levels for exceptional running accuracy.
- DGA: Specifies the Universal Matchable (SU) designation. Two bearings can be paired in a universal arrangement ("DB" or "DF") without selective mounting to achieve the desired preload and stiffness.
71911 ACE/HCPA9ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds (39,000 rpm). This construction also provides superior resistance to wear and a longer service life.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent dimensional stability and low friction at high speeds, contributing to smooth operation and the bearing's impressive high-speed capabilities.
- High Rigidity & Load Capacity: The 25° contact angle and precision ground raceways provide high rigidity, enabling the bearing to handle significant combined radial and axial loads (Dynamic: 5355 lbf, Static: 4500 lbf).
- Ultra-Precision & Preload: Manufactured to PA9A tolerance class and supplied with extra light preload (Class A), this bearing guarantees minimal run-out and vibration, which is critical for applications demanding the highest levels of accuracy.
- Universal Matchability (SU): The DGA suffix confirms that bearings are universally matchable. This allows for simplified mounting of pairs to achieve precise axial rigidity and preload without the need for selective sorting, reducing assembly time and complexity.
71911 ACE/HCPA9ADGA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where speed, precision, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and high-speed electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
