S71911 ACE/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71911 ACE/HCP4ADT
Basic Information
System of measurement
Metric
Weight
0.29 kg
Tolerance class
P4A
Seal type
Sealed
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
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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S71911 ACE/HCP4ADT Bearing Product Overview & Core Advantages
The S71911 ACE/HCP4ADT is a precision duplex tandem angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This matched pair bearing set features a P4A super-precision tolerance class and is preloaded for immediate high-rigidity operation. Its construction with ceramic balls and a phenolic cage enables superior high-speed capabilities and thermal stability. The bearing is sealed and pre-lubricated, making it a ready-to-install, long-life solution for complex load conditions, including combined radial and axial loads.
S71911 ACE/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Designates an angular contact ball bearing. |
| 71911 | Standard size designation (55mm bore, 80mm OD, 26mm width). |
| ACE | Specific internal design and contact angle (25°). |
| HC | Indicates the use of hybrid ceramic balls (Silicon Nitride). |
| P4A | Denotes a super-precision tolerance class for exceptional running accuracy. |
| DT | Signifies a Duplex Tandem arrangement, where two bearings are matched to share axial loads in the same direction. |
S71911 ACE/HCP4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem (DT) arrangement and 25° contact angle are optimized to handle significant combined radial and axial loads in one direction. The set is supplied with a preload, ensuring maximum system stiffness and precise shaft positioning from the moment of installation.
- Superior High-Speed Performance: The combination of hybrid ceramic balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and operating temperatures. This allows the bearing to achieve a high limiting speed of 34,000 rpm, making it ideal for high-speed spindles.
- Extended Service Life & Reliability: Ceramic balls are harder, lighter, and more resistant to wear and degradation than steel, leading to a dramatically longer operational life. The integral seals protect the precision internals from contamination.
- Thermal Stability: The phenolic cage and ceramic balls exhibit lower thermal expansion compared to metal components, maintaining preload and accuracy over a wide temperature range.
S71911 ACE/HCP4ADT Bearing Typical Application Areas
This bearing is engineered for the most demanding high-precision, high-speed rotational systems. Key applications 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 other high-RPM machinery.
- Advanced Robotic Systems: Critical joints and drives requiring high rigidity and accuracy.
