71926 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71926 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
41850 lbf
Radial static load rating
68625 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
Price:
$ 2345.34
/ each
In Stock
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71926 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71926 ACD/P4ATBTB is a super-precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for the most demanding applications, this bearing arrangement delivers exceptional system rigidity and stability, capable of supporting complex combined loads including high radial and thrust loads from both directions. Manufactured to an ultra-precise P4A tolerance class, it guarantees superior running accuracy and is optimized for high-speed operation up to 7,500 rpm. The phenolic cage and standard lubrication ensure reliable performance within a wide temperature range.
71926 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71926 | Basic bearing series and size designation (130 mm bore, 180 mm OD). |
| ACD | Contact angle of 25°, a standard for angular contact bearings. |
| P4A | Indicates a super-precision tolerance class, exceeding normal P4 standards for enhanced running accuracy. |
| TBT | Specifies the Triplex Back-to-Back matched arrangement of three bearings. |
71926 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The triplex back-to-back (TBT) configuration creates an extremely rigid bearing system, effectively resisting moment loads and maintaining shaft positioning under heavy combined loads.
- High Load Capacity: With a dynamic load rating of 41,850 lbf and a static load rating of 68,625 lbf, this set is built to handle significant radial and bidirectional axial forces.
- Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, while the 25° contact angle provides an excellent balance between radial and axial load capacity, enabling stable operation at the limiting speed of 7,500 rpm.
- Precision Engineering: The P4A tolerance class and tight dimensional tolerances on the bore, outside diameter, and width ensure minimal runout and vibration, which is critical for high-precision spindles.
71926 ACD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance machinery requiring maximum rigidity and speed. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling and high-frequency motors.
- High-Frequency Machinery: Where extreme rotational accuracy and system stability are non-negotiable.
