71906 ACE/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71906 ACE/P4ADT
Basic Information
System of measurement
Metric
Weight
0.1 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
18 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1960 lbf
Radial static load rating
1372 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
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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71906 ACE/P4ADT Bearing Product Overview & Core Advantages
The 71906 ACE/P4ADT is a precision angular contact ball bearing supplied as a matched duplex tandem (DT) set. Engineered for applications requiring exceptional accuracy and rigidity, this bearing is preloaded and manufactured to P4A tolerance class, ensuring minimal runout and superior rotational precision. Its primary advantage lies in its ability to handle high combined loads—significant radial and one-direction thrust loads—simultaneously, making it an ideal choice for high-speed, high-precision spindles and machinery.
71906 ACE/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
The model number 71906 ACE/P4ADT provides detailed technical specifications:
- 71906: Denotes the bearing series and size (30mm bore, 47mm OD, 18mm width).
- ACE: Indicates a 25° contact angle and a phenolic resin cage.
- P4A: Specifies the tolerance class, representing very high dimensional and running accuracy.
- DT: Signifies a Duplex Tandem matched set of two bearings, designed to increase axial load capacity in one direction.
71906 ACE/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle provide superior axial rigidity and significantly increased thrust load capacity in one direction, essential for resisting machining forces.
- High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to low friction and stable operation at the high limiting speed of 100,500 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing ensures minimal vibration and exceptional running accuracy for demanding applications.
- Preload & Stability: The set is supplied preloaded, eliminating internal clearance to provide enhanced shaft positioning accuracy and system stiffness from the moment of installation.
71906 ACE/P4ADT Bearing Typical Application Areas
This high-precision bearing is engineered for advanced machinery where speed, accuracy, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and small precision motors.
