71906 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71906 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.096 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 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
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71906 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71906 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This P4A tolerance class bearing is supplied as a pre-matched Back-to-Back (DB) duplex set, enabling it to withstand significant combined loads (radial and axial loads from both directions) simultaneously. Its extra light preload (Class A) ensures minimal runout and precise shaft positioning, making it ideal for high-precision, high-rigidity systems. The phenolic cage and optimized 25° contact angle contribute to stable operation at high speeds.
71906 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71906 | Basic bearing series and size designation (30mm bore, 47mm OD, 18mm width). |
| AC | Angular Contact ball bearing. |
| D | Duplex (two single bearings mounted as a pair). |
| DB | Back-to-Back mounting arrangement. |
| P4A | High Precision Tolerance Class (superior to ABEC 7). |
71906 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists overturning moments and can handle substantial combined radial and axial loads from both directions.
- Precision & Stability: Manufactured to P4A tolerance class with an extra light preload, this bearing set guarantees minimal axial and radial runout, ensuring exceptional running accuracy and positional stability for the shaft.
- High-Speed Capability: The lightweight and robust phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 83,000 rpm. The 25° contact angle provides an optimal balance between axial load capacity and speed performance.
- Optimized Internal Geometry: Precision-ground chrome steel rings and balls, along with a carefully calculated ball diameter and quantity, ensure smooth operation, long service life, and consistent performance under demanding conditions.
71906 ACD/P4ADBA Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-accuracy transmission systems.
- High-Frequency Spindles: Used in PCB drilling and routing machines.
- Medical Equipment: Centrifuges and high-speed dental handpieces.
- Aerospace Actuation Systems: Where reliability and precision under load are paramount.
