7209 CD/P4ATBTB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7209 CD/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
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
20768 lbf
Radial static load rating
20925 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
In Stock
Price available upon request.
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7209 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 7209 CD/P4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set provides superior stiffness and stability, enabling it to handle significant combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with a light preload (Class B), it is engineered for high-speed operation up to 41,000 rpm, making it an ideal choice for high-precision, high-reliability machinery.
7209 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7209 CD/P4ATBTB is decoded as follows:
- 7209: Basic bearing series, denoting a 45 mm bore, 85 mm OD, and angular contact design.
- C: Denotes a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is supplied with a specific internal design and light preload.
- P4A: Specifies the tolerance class, indicating very high precision for inner and outer ring runouts and dimensions.
- TBT: Designates the bearing as part of a Triplex Back-to-Back matched set of three bearings, providing maximum rigidity.
7209 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy combined loads.
- Optimized for High Speeds: The 15° contact angle and phenolic cage reduce friction and centrifugal forces, enabling stable operation at the high limiting speed of 41,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class with tight bore, outer diameter, and width tolerances, ensuring minimal runout and superior running accuracy for demanding spindles.
- Superior Load Capacity: With a dynamic load rating of 20,768 lbf and static load rating of 20,925 lbf, this bearing set is built for longevity and reliability in rigorous applications.
7209 CD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance machinery where extreme accuracy, high speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace Positioning Systems
