S71911 ACE/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71911 ACE/P4ADT
Basic Information
System of measurement
Metric
Weight
0.35 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
Chrome Steel
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/P4ADT Bearing Product Overview & Core Advantages
The S71911 ACE/P4ADT is a precision angular contact ball bearing configured in a duplex tandem (DT) arrangement. This pre-loaded pair is engineered to deliver exceptional performance in applications demanding high rigidity and accuracy. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) in one direction with superior stability. Manufactured to P4A tolerance class, it ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high rotational accuracy are critical.
S71911 ACE/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| S71911 | Denotes the bearing series and size (55mm bore, 80mm OD, 26mm width). |
| ACE | Indicates a 25° contact angle and specific internal design optimized for high stiffness and speed. |
| P4A | Specifies the tolerance class, signifying very high precision levels for running accuracy and dimensional tolerances. |
| DT | Signifies the bearings are supplied as a Duplex Tandem matched set. This arrangement increases axial load capacity in one direction and system rigidity. |
S71911 ACE/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle create an exceptionally rigid bearing system capable of supporting high radial loads and substantial unidirectional axial loads.
- Precision High-Speed Operation: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and smooth operation at the high limiting speed of 34,000 rpm. The P4A precision grade ensures minimal vibration.
- Optimized for Performance: Components made from chrome steel provide high fatigue life and durability. The bearing is pre-lubricated with grease, offering reliable operation within a temperature range of -30°C to 110°C.
- Sealed & Pre-loaded: The sealed design protects against contamination. The set is supplied pre-loaded, eliminating internal clearance and ensuring immediate, precise performance upon installation.
S71911 ACE/P4ADT Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Other precision rotary systems requiring high rigidity, high speed, and exceptional accuracy.
