71911 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 CD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
0.54 kg
Tolerance class
P4A
Seal type
Open
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
Lubricated
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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71911 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71911 CD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a matched triplex set in a back-to-back arrangement (TBT), it delivers exceptional system rigidity and rotational accuracy. Its defining characteristics include a P4A tolerance class for ultra-precise running, an extra light preload (Class A) for minimal friction at high speeds, and a 15° contact angle optimized for handling combined loads. This bearing is engineered for high-speed spindles and other machinery requiring maximum precision, stiffness, and reliability.
71911 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 CD/P4ATBTA provides a detailed technical specification:
- 71911: Basic bearing series, indicating a super-precision, light-series angular contact ball bearing with a 55 mm bore.
- C: Denotes a 15° contact angle.
- D: Indicates the bearing is part of a matched set with specific pre-load and runout tolerances.
- P4A: Specifies the tolerance class, which is superior to ABEC 7 (P4), ensuring extremely tight dimensional and running accuracy.
- TBT: Identifies the matched arrangement as Triplex Back-to-Back. This configuration provides high moment stiffness and stability.
- A: Signifies the preload level as Extra Light (Class A), ideal for very high-speed operation.
71911 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Ultra-High Rigidity & Stability: The triplex back-to-back (TBT) arrangement of three matched bearings creates an exceptionally rigid bearing system capable of withstanding heavy moment loads and complex forces, making it ideal for machine tool spindles.
- Super-Precision Performance: Manufactured to a P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Optimized High-Speed Capability: The combination of an extra light preload (A), a lightweight and robust phenolic resin cage, and a 15° contact angle enables very high limiting speeds (34,000 rpm) with low heat generation.
- Superior Load Capacity: The angular contact design efficiently supports combined radial and axial loads. With a dynamic load rating of 9360 lbf and a static load rating of 9900 lbf, it offers reliable performance under significant stress.
- Premium Materials: Constructed from chrome steel for both rings and balls, the bearing ensures high durability and long service life under demanding operating conditions.
71911 CD/P4ATBTA Bearing Typical Application Areas
This high-precision bearing is specifically designed for advanced machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and turning centers.
- Precision Grinding Spindles: Where minimal runout is essential for part quality.
- High-Speed Robotic Drives: In articulated arms and precision positioning systems.
- Advanced Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
- Aerospace Test & Measurement Equipment: For applications requiring extreme precision and reliability.
