S71911 CD/P4ATBTA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71911 CD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
0.55 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
39 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9360 lbf
Radial static load rating
9900 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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 CD/P4ATBTA Bearing Product Overview & Core Advantages
The S71911 CD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. This metric bearing features a triplex back-to-back (TBT) matched set of three individual bearings, delivering exceptional system rigidity and stability. Its P4A tolerance class ensures ultra-high running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and vibration are critical. The combination of a 15° contact angle and phenolic cage enables superior high-speed performance while effectively managing combined radial and axial loads.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71911 | Basic bearing series, indicating a 55 mm bore, 80 mm OD, and 39 mm width. |
| CD | Indicates a 15° contact angle and specific internal design optimized for high-speed operation. |
| P4A | Specifies the tolerance class, denoting extremely high precision for bore diameter, outside diameter, and width. |
| TB | Denotes the bearings are supplied as a triplex back-to-back (TBT) matched set. |
| TA | Indicates an Extra light (Class A) preload is applied to the matched set for optimal stiffness and positioning accuracy. |
S71911 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Ultra-High Rigidity & Stability: The triplex back-to-back (TBT) arrangement of three bearings creates an exceptionally rigid bearing system, capable of resisting complex moment loads and maintaining precise shaft positioning under heavy cutting forces or other demanding conditions.
- Superior High-Speed Capability: The 15° contact angle and lightweight phenolic resin cage are engineered for minimal centrifugal forces and low friction, enabling the bearing to achieve its high limiting speed of 34,000 rpm with minimal heat generation.
- Exceptional Precision: Manufactured to P4A tolerance class, this bearing guarantees ultra-tight dimensional and running accuracy, which is fundamental for applications requiring high rotational accuracy and reduced vibration levels.
- Optimized Load Capacity: The design effectively handles combined loads (radial and axial), with a dynamic load rating of 9360 lbf and a static load rating of 9900 lbf, ensuring long-term reliability.
- Sealed & Pre-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within its specified temperature range.
S71911 CD/P4ATBTA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Industrial Pumps & Compressors: High-speed rotors requiring precise axial positioning.
- Robotics: High-accuracy rotary joints and arm actuators.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation components.
