7209 ACD/P4AQBCA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7209 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
1.64 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
76 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
24300 lbf
Radial static load rating
26550 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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.
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7209 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 7209 ACD/P4AQBCA is a high-precision quadruplex matched angular contact ball bearing designed for demanding applications requiring exceptional rigidity and rotational accuracy. This P4A tolerance class bearing features a back-to-back (QBC) arrangement of four individual bearings, enabling it to withstand combined radial and axial loads from both directions simultaneously. Its extra light preload (Class A) minimizes deflection under operational stresses, making it ideal for high-speed spindles and other precision machinery where maximum stiffness and running accuracy are critical.
7209 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series, 45 mm bore, 85 mm OD. |
| ACD | **A**ngular **C**ontact design with a **25° contact angle**. |
| P4A | **High-Precision Tolerance Class** (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| QBC | **Q**uadruplex **B**ack-to-**B**ack arrangement. A set of four bearings mounted in a back-to-back configuration for maximum **moment stiffness**. |
7209 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Superior Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of supporting significant combined loads and resisting overturning moments. The 25° contact angle is optimized for handling substantial axial loads in both directions.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, minimizes friction, and contributes to the high limiting speed of 41,000 rpm. This makes it suitable for high-speed applications.
- Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing guarantees exceptional running accuracy and minimal vibration.
- Optimized for Precision Mounting: The bearings are supplied as a pre-lubricated and matched set, ensuring consistent performance and simplifying installation in high-precision assemblies.
7209 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring the highest levels of rotational accuracy and rigidity.
- High-Frequency Machining Centers: Where minimal runout and thermal stability are paramount.
- Other Precision Rotary Equipment: Such as high-speed pumps and precision measuring instruments.
