7209 ACD/P4ATBTB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7209 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
1.23 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
57 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
19890 lbf
Radial static load rating
20250 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 239.06
/ each
In Stock
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7209 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 7209 ACD/P4ATBTB is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing arrangement is designed to handle significant combined loads (radial and axial) from both directions simultaneously. Manufactured to the stringent P4A tolerance class, it offers superior running accuracy and is preloaded for immediate high-performance operation. Its design is optimized for high rigidity and stable performance in demanding machinery.
7209 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Contact Angle of 25°. Optimized for carrying substantial axial loads. |
| P4A | High precision tolerance class, exceeding ABEC 7 (P4) standards, with specific focus on runout and width tolerances. |
| TBT | Triplex Back-to-Back arrangement. A set of three bearings mounted back-to-back, providing maximum rigidity and moment load capacity. |
| B (in Preload) | Light preload class. Reduces axial and radial play for precise shaft positioning without generating excessive heat. |
7209 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Moment Stiffness: The triplex back-to-back (TBT) configuration creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machine tools and spindles.
- Superior Load Capacity: The 25° contact angle and the use of three bearings in a set significantly increase the combined load rating, allowing it to manage heavy radial and bidirectional axial loads simultaneously.
- High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 41,000 rpm, making it suitable for high-speed applications.
- Precision Performance: The P4A tolerance class ensures minimal runout and tight dimensional control, leading to smooth operation, reduced vibration, and enhanced machine accuracy.
- Optimized Material Selection: Constructed from chrome steel for rings and balls, providing high hardness, wear resistance, and long service life under demanding conditions.
7209 ACD/P4ATBTB Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
