S71911 ACD/P4ADGA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71911 ACD/P4ADGA
Basic Information
System of measurement
Metric
Weight
0.37 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
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
Grease
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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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S71911 ACD/P4ADGA Bearing Product Overview & Core Advantages
The S71911 ACD/P4ADGA is a super-precision double row angular contact ball bearing engineered for applications demanding exceptional accuracy, rigidity, and speed. Its design is optimized to simultaneously handle combined loads (radial and bidirectional axial loads) efficiently. Manufactured to the stringent P4A tolerance class and featuring a universal matchable (SU) design, this bearing offers outstanding running accuracy and stability, making it ideal for high-reliability, high-performance spindles and precision machinery.
S71911 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| 719 | Indicates a high-precision angular contact ball bearing series with a 25° contact angle. |
| 11 | Specifies the bore diameter code (55 mm). |
| ACD | Signifies a 25° contact angle and a double row design. |
| P4A | Denotes an ultra-high tolerance class (geometric tolerance equivalent to ABEC 7/ISO P4), ensuring extreme running accuracy. |
| DGA | Indicates the bearing is sealed on both sides and pre-lubricated with grease. |
S71911 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row ball complement and 25° contact angle provide superior high rigidity, enabling the bearing to support significant combined loads and moment loads effectively.
- Super-Precision Performance: Manufactured to P4A tolerances, this bearing guarantees minimal runout and vibration, which is critical for maintaining precision in high-speed applications.
- Optimized High-Speed Operation: The lightweight and robust phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed of 34,000 rpm. The universal matchable (SU) design allows for flexible mounting arrangements in preloaded sets for optimal stiffness.
- Long-Term Reliability & Low Maintenance: The integral seals protect against contamination, and the factory-applied grease lubrication ensures consistent performance across a wide temperature range (-30°C to 110°C), reducing maintenance needs.
S71911 ACD/P4ADGA Bearing Typical Application Areas
This precision bearing is ideally suited for high-demand applications, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
