S71911 CD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71911 CD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
0.73 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
52 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
11408 lbf
Radial static load rating
13162 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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
Price available upon request.
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S71911 CD/P4AQBCA Bearing Product Overview & Core Advantages
The S71911 CD/P4AQBCA is a super-precision angular contact ball bearing configured as a Quadruplex Back-to-Back (QBC) matched set. This configuration is engineered to deliver exceptional system rigidity and stability, making it ideal for applications requiring the highest levels of running accuracy. Manufactured to a P4A tolerance class and preloaded to Extra Light (Class A), it is optimized for high-speed operation while providing superior capacity for combined radial and axial loads. The sealed design with factory-applied grease ensures long-term, maintenance-free performance.
S71911 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
The model number S71911 CD/P4AQBCA provides detailed technical specifications:
- S7: Indicates a series of high-precision, high-speed angular contact ball bearings.
- 1911: Denotes the standard size series (19) and bore diameter code (11 for 55mm bore).
- CD: Specifies a 15° contact angle and specific internal design for high-speed, high-precision applications.
- P4A: The tolerance class, signifying extremely tight dimensional and running accuracy exceeding ABEC 7/ISO P4 standards.
- QBC: Identifies the bearing as part of a Quadruplex Back-to-Back matched set of 4 bearings.
- A: Denotes the Extra Light preload level, ideal for minimizing friction and heat generation at very high speeds.
S71911 CD/P4AQBCA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Stability: The Quadruplex Back-to-Back (QBC) arrangement of four bearings creates an exceptionally stiff bearing system, effectively resisting complex moment loads and ensuring precise shaft positioning.
- Superior Load Capacity: The angular contact design with a 15° contact angle allows the bearing set to accommodate significant combined (radial and axial) loads simultaneously.
- High-Speed Capability: The combination of a lightweight phenolic resin cage, P4A precision, and Extra Light preload enables a high limiting speed of 34,000 rpm with minimal friction and heat buildup.
- Sealed & Lubricated for Life: As a sealed bearing pre-lubricated with high-performance grease, it is protected from contamination and is designed for maintenance-free operation within its specified temperature range.
- Precision Engineering: Manufactured from chrome steel with tight tolerances on all dimensions (bore, OD, width), ensuring predictable performance and easy integration into precision assemblies.
S71911 CD/P4AQBCA Bearing Typical Application Areas
This high-precision bearing set is specifically designed for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: In PCB drilling, semiconductor manufacturing, and other precision machining equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other instrumentation requiring extreme accuracy.
