71926 CD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71926 CD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
4.65 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
130 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
180 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
73125 lbf
Limiting speed
7.5 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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71926 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 71926 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 preloaded to deliver superior system stiffness and stability. Its P4A tolerance class ensures extremely tight dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high reliability are critical.
71926 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71926 | Basic bearing designation (Bore: 130 mm, OD: 180 mm, Width: 72 mm) |
| CD | Specific internal design with a 15° contact angle, optimized for high rigidity and combined loads. |
| P4A | Super-precision tolerance class with enhanced running accuracy requirements. |
| TBT | Triplex Back-to-Back arrangement. Three bearings are supplied as a preloaded, matched set for maximum system rigidity. |
71926 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The triplex back-to-back (TBT) arrangement with a Light (Class B) preload creates an exceptionally stiff bearing system that effectively resists moment loads and minimizes axial and radial deflection under operation.
- Superior Load Capacity: The 15° contact angle design enables the bearing to handle significant combined loads (radial and axial). With a dynamic load rating of 44,775 lbf and a static load rating of 73,125 lbf, it is built for demanding applications.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design and precision grinding contribute to a high limiting speed of 7,500 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class standards, this bearing guarantees minimal running vibration and precise shaft positioning, which is crucial for high-precision machining and instrumentation.
71926 CD/P4ATBTB Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Industrial Pumps & Compressors: Where precise shaft control and high rigidity are needed.
