71906 ACD/P4ATBTD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71906 ACD/P4ATBTD
Basic Information
System of measurement
Metric
Weight
0.14 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 mm
Outside diameter tolerance
-0.004mm to 0
Width
27 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3285 lbf
Radial static load rating
2902 lbf
Limiting speed
83 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
Heavy / Class D
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 71906 ACD/P4ATBTD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This triplex back-to-back (TBT) matched set delivers superior performance under combined loads and heavy preload conditions (Class D). Engineered to P4A tolerance standards, it offers high running accuracy, making it ideal for high-precision, high-rigidity systems where uncompromising performance is critical.
71906 ACD/P4ATBTD Bearing Model Code Explained, Specifications & Naming Convention
The model number 71906 ACD/P4ATBTD is decoded as follows:
- 71906: Basic bearing series, indicating a light-weight, high-precision angular contact design with a 30mm bore.
- A: Denotes a 25° contact angle, optimized for supporting high axial loads.
- C: Indicates the bearing is supplied with a phenolic (polyamide) cage.
- D: Specifies a Heavy preload (Class D) for maximum system rigidity.
- P4A: Identifies the tolerance class, signifying very high precision for dimensional and running accuracy.
- TBT: Denotes the bearing is part of a Triplex Back-to-Back matched set of 3 bearings.
Structural Features and Performance Benefits
- High Rigidity and Stability: The triplex back-to-back arrangement creates an extremely rigid bearing system, capable of resisting complex moment loads and shaft deflection, which is critical for maintaining precision under heavy cutting forces or operational stresses.
- Superior Load Capacity: With a 25° contact angle and heavy preload (Class D), this bearing set is engineered to handle significant combined radial and axial loads simultaneously. The matched set ensures even load distribution across all three bearings.
- Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees high running accuracy, minimal vibration, and consistent performance, which is essential for applications like high-speed machining spindles.
- Optimized for High-Speed Operation: The lightweight phenolic cage reduces centrifugal forces, contributes to lower operating temperatures, and enables a high limiting speed, making it suitable for demanding high-speed applications.
71906 ACD/P4ATBTD Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance machinery and systems, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme rigidity and accuracy.
- Precision Gearboxes and High-Frequency Motorized Spindles.
- Industrial Pumps and Compressors operating under high loads and speeds.
- Robotics and Automation Equipment where precise motion control is paramount.
