71911 CD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71911 CD/P4ATBTB
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
Light / Class B
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/P4ATBTB Bearing Product Overview & Core Advantages
The 71911 CD/P4ATBTB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a triplex back-to-back (TBT) matched set, this bearing is engineered to handle combined loads with superior performance. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other critical machinery where high rigidity and minimal runout are paramount.
71911 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 CD/P4ATBTB provides detailed technical specifications:
- 71911: Basic bearing series, indicating a metric, angular contact design with a 55 mm bore, 80 mm OD, and 39 mm width.
- C: Represents a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing is supplied with a light preload (Class B) for enhanced stiffness and precise shaft positioning.
- P4A: Denotes an ultra-precision tolerance class with stricter limits on dimensional and running accuracy than standard P4.
- TBT: Specifies the bearing is one of three in a Triplex Back-to-Back matched arrangement, providing maximum moment stiffness and stability.
71911 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) arrangement of three matched bearings creates an exceptionally rigid bearing system, effectively resisting complex moment loads and ensuring precise shaft guidance.
- Superior Precision: Manufactured to P4A tolerance class, this bearing guarantees minimal dimensional variation and superior running accuracy, which is critical for high-precision applications.
- Optimized for High Speeds: The 15° contact angle and lightweight phenolic cage reduce centrifugal forces and friction, enabling high limiting speeds (up to 34,000 rpm). The phenolic cage also offers excellent performance under high centrifugal loads.
- High Load Capacity: Manufactured from high-grade chrome steel for both rings and balls, the bearing provides a high dynamic and static load rating (9360 lbf / 9900 lbf), ensuring long service life under demanding conditions.
- Pre-Configured Performance: The factory-applied light preload (Class B) eliminates internal clearance, enhancing system stiffness and rotational accuracy from the moment of installation.
71911 CD/P4ATBTB Bearing Typical Application Areas
This high-precision bearing set is ideally suited for applications requiring the ultimate in accuracy, speed, and rigidity, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing equipment.
- High-Frequency Motors: Spindles for CNC machinery.
- Robotics: High-accuracy joints and rotary actuators.
