7209 CD/P4AQBTB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7209 CD/P4AQBTB
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
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
25200 lbf
Radial static load rating
28125 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
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/P4AQBTB Bearing Product Overview & Core Advantages
The 7209 CD/P4AQBTB is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a Quadruplex Tandem Back-to-Back (QBT) matched set, it delivers exceptional high rigidity and axial load-carrying capacity. Its P4A tolerance class ensures ultra-high running accuracy, making it ideal for machine tool spindles and other high-speed, high-precision machinery where uncompromising performance is required.
7209 CD/P4AQBTB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7209 CD/P4AQBTB provides detailed technical specifications:
- 7209: Basic bearing series and size code (45mm bore, 85mm OD).
- C: 15° contact angle, optimized for high-speed applications with significant axial loads.
- D: Indicates a specific internal design for high precision.
- P4A: Denotes an ultra-precision tolerance class with enhanced dimensional and running accuracy.
- QBTB: Specifies the bearing is part of a Quadruplex (4 bearings) Tandem Back-to-Back pre-loaded set, providing maximum system rigidity.
7209 CD/P4AQBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The QBTB matched arrangement of four bearings creates an extremely stiff bearing system capable of withstanding heavy combined loads (radial and axial) from multiple directions, which is critical for machining accuracy.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, leading to superior surface finishes and extended tool life.
- Optimized High-Speed Capability: The phenolic resin cage is lightweight and robust, enabling stable operation at the high limiting speed of 41,000 rpm. The standard 15° contact angle further enhances high-speed suitability.
- Premium Material Construction: Made from high-grade chrome steel for rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under continuous heavy-duty use.
7209 CD/P4AQBTB Bearing Typical Application Areas
This bearing is engineered for high-performance machinery, including:
- Machine Tool Spindles (e.g., CNC machining centers, grinding spindles)
- High-Frequency Motors
- Precision Grinding Equipment
- Aerospace & Defense Systems
