71926 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71926 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
3.1 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
48 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
31500 lbf
Radial static load rating
45900 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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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Product Overview and Core Advantages
The 71926 ACD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back arrangement bearing set is preloaded to Extra Light (Class A) specifications, providing superior system stiffness and minimal runout. It excels at handling combined loads, managing significant radial loads alongside thrust loads in both directions. Manufactured to P4A tolerance class, it guarantees ultra-precise dimensions and smooth, quiet operation, making it ideal for high-speed, high-precision machinery.
71926 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact, Duplex arrangement. Specifically denotes a Back-to-Back (DB) mounting configuration. |
| P4A | High precision tolerance class. P4A specifies very tight dimensional and running accuracy tolerances, superior to ABEC 7. |
| DB | (Implied by ACD) Duplex Back-to-Back. This arrangement provides high moment rigidity and excellent stability under complex loads. |
Structural Features and Performance Benefits
- High Rigidity and System Stability: The duplex back-to-back (DB) arrangement and Class A preload create an exceptionally rigid bearing system that effectively resists moment loads and minimizes axial and radial deflection, ensuring precise shaft positioning.
- Superior Load Capacity: With a 25° contact angle and robust construction, this bearing is engineered to handle high combined radial and axial loads simultaneously. The dynamic and static load ratings of 31,500 lbf and 45,900 lbf, respectively, confirm its capability for demanding applications.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the open design and factory-applied lubrication contribute to lower operating temperatures, enabling a high limiting speed of 11,000 rpm.
- Precision Engineering: The P4A tolerance class ensures minimal dimensional variation and superior running accuracy. The tight bore and outside diameter tolerances (within -0.004mm to 0) guarantee a precise fit and optimal performance.
71926 ACD/P4ADBA Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where extreme accuracy and minimal runout are critical.
- High-Frequency Motors and Spindles: Demanding applications in PCB drilling and semiconductor manufacturing.
- Industrial Pumps and Compressors: For efficient operation under significant radial and axial loads.
