71811 CD/P4TBTL
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71811 CD/P4TBTL
Basic Information
System of measurement
Metric
Weight
0.24 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.004mm to 0
Width
27 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4972 lbf
Radial static load rating
7312 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
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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71811 CD/P4TBTL Bearing Product Overview & Core Advantages
The 71811 CD/P4TBTL is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and rotational accuracy. This bearing is supplied as a Triplex Back-to-Back (TBT) matched set, consisting of three preloaded bearings. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high stability. The P4 tolerance class ensures ultra-precision, making it ideal for high-speed spindles and other demanding machinery where high rigidity and minimal runout are critical.
71811 CD/P4TBTL Bearing Model Code Explained, Specifications & Naming Convention
The model number 71811 CD/P4TBTL is decoded as follows:
- 71811: Basic bearing series, indicating a metric, angular contact design with a 55mm bore, 72mm OD, and 27mm width.
- C: Represents a 15° contact angle, optimized for high-speed operation with moderate axial load capacity.
- D: Indicates enhanced internal geometry and manufacturing for high-precision applications.
- P4: Denotes a super-precision tolerance class with extremely tight dimensional and running accuracy limits.
- TBT: Specifies the bearing arrangement as a Triplex Back-to-Back matched set. This configuration provides maximum rigidity against moment loads.
- L: Signifies that the bearings are lubricated from the factory.
71811 CD/P4TBTL Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The Triplex Back-to-Back (TBT) arrangement creates a highly rigid bearing system that effectively resists complex moment and tilting loads, ensuring exceptional operational stability.
- Precision Performance: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is essential for applications requiring extreme rotational accuracy.
- Optimized for High Speeds: The 15° contact angle and phenolic resin cage reduce friction and centrifugal forces, enabling a high limiting speed of 34,000 rpm.
- Superior Load Capacity: With a dynamic load rating of 4972 lbf and a static load rating of 7312 lbf, this bearing set is engineered to handle significant combined radial and axial loads.
- Preloaded Matched Set: Supplied as a preloaded triplex set, the bearings are ready for installation, eliminating complex adjustment procedures and ensuring consistent, immediate performance.
71811 CD/P4TBTL Bearing Typical Application Areas
This precision bearing set is ideally suited for high-end machinery and equipment, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace & Defense Positioning Systems
- Medical Equipment Spindles
