7209 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7209 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.82 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
38 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
15795 lbf
Radial static load rating
13950 lbf
Limiting speed
41 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7209 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7209 CD/P4ADBB is a duplex pair of precision angular contact ball bearings arranged in a Back-to-Back (DB) configuration. This matched set is designed for applications requiring high rigidity and exceptional running accuracy under combined loads (radial and axial). Preloaded to Light / Class B and manufactured to P4A tolerance class, this bearing assembly delivers superior performance, stability, and longevity in demanding, high-precision environments. Its compact design integrates the performance of two bearings into a single, ready-to-install unit.
7209 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series, indicating a 45 mm bore, 85 mm OD, and 19 mm single bearing width. |
| C | 15° contact angle, optimized for supporting significant axial loads. |
| D | Indicates the bearing is part of a duplex pair (two bearings). |
| P4A | High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy tolerances for the entire matched set. |
| DB | Back-to-Back Arrangement. This configuration provides high moment rigidity and excellent stability under complex loading conditions. |
| B | Specifies a Light preload applied to the matched set, reducing axial and radial play for precise shaft positioning. |
7209 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The Back-to-Back (DB) duplex arrangement creates a wide, rigid support system that effectively resists overturning moments and complex combined loads, ensuring exceptional shaft positioning accuracy.
- Superior Load Capacity: The 15° contact angle and duplex design enable the bearing set to handle high radial dynamic load ratings (15,795 lbf) and significant bidirectional axial loads simultaneously.
- Precision Performance: Manufactured to P4A tolerance class with a phenolic cage, this set guarantees low noise, low vibration, and smooth operation at high speeds, with a limiting speed of 41,000 rpm.
- Optimized for High-Speed Operation: The lightweight phenolic cage is ideal for high-speed applications, reducing centrifugal forces and friction, while the pre-lubrication ensures immediate and reliable operation.
- Durable Construction: Components made from chrome steel provide high wear resistance and long service life under demanding conditions.
7209 CD/P4ADBB Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance applications where rigidity, accuracy, and speed are critical. Key industries and machinery include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high precision and rigidity.
- High-Frequency Spindles: In PCB drilling and precision engraving machines.
- Precision Gearboxes: Supporting shafts in high-speed transmission systems.
- Industrial Pumps & Compressors: For handling axial and radial loads in rotating assemblies.
- Robotic Arms and Precision Axes: Where accurate and repeatable positioning is essential.
