71906 ACD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71906 ACD/HCP4ADT
Basic Information
System of measurement
Metric
Weight
0.09 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
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2498 lbf
Radial static load rating
1946 lbf
Limiting speed
83 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
Ceramic
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 ACD/HCP4ADT Bearing Product Overview & Core Advantages
The 71906 ACD/HCP4ADT is a duplex tandem (DT) preloaded pair of super-precision angular contact ball bearings, engineered for the most demanding high-performance applications. This metric bearing set is characterized by its exceptional rotational accuracy (P4A tolerance class) and ability to handle high axial loads in one direction. The combination of a ceramic ball material and a phenolic cage enables superior high-speed performance and thermal stability, making it an ideal solution for spindles requiring maximum rigidity and minimal thermal growth.
71906 ACD/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing series and size designation (30mm bore, 47mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a duplex (two-bearing) set. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. |
| P4A | Specifies the super-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DT | Duplex Tandem arrangement. The two bearings are mounted to face the same direction, doubling the axial load capacity in that direction. |
71906 ACD/HCP4ADT Bearing Structural Features & Performance Benefits
- Enhanced Rigidity & Axial Load Capacity: The DT preloaded arrangement creates a highly rigid bearing system capable of supporting very high unidirectional axial loads, making it exceptionally stable under heavy cutting forces.
- Superior High-Speed Capability: The hybrid ceramic construction (steel rings with silicon nitride balls) reduces centrifugal forces, lowers operating temperature, and enables a high limiting speed of 83,000 rpm. The lightweight phenolic cage further contributes to smooth operation at extreme velocities.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on bore, OD, and width, this bearing ensures minimal runout and superior positioning accuracy for the spindle.
- Optimized Lubrication: The bearing is pre-lubricated, ensuring immediate and reliable performance upon installation, which is critical for high-speed spindle start-up.
71906 ACD/HCP4ADT Bearing Typical Application Areas
This precision bearing set is specifically designed for high-performance machinery where speed, accuracy, and rigidity are paramount. Key applications include:
- High-Frequency / High-Speed Machining Spindles (e.g., for PCBs, mold & die making)
- Precision Grinding Spindles
- High-speed Routing and Milling heads
- Advanced Dental and Medical Tooling Spindles
