7209 ACD/HCP4AQBTA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7209 ACD/HCP4AQBTA
Basic Information
System of measurement
Metric
Weight
1.36 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 Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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7209 ACD/HCP4AQBTA Bearing Product Overview & Core Advantages
The 7209 ACD/HCP4AQBTA is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional stiffness and high-speed performance. This matched set of four bearings is configured in a Tandem Back-to-Back (QBT) arrangement, enabling it to accommodate combined radial and axial loads simultaneously. Manufactured to P4A tolerance class and featuring a ceramic ball and phenolic cage construction, it delivers superior operational accuracy, thermal stability, and is ideally suited for high-reliability, high-precision machinery.
7209 ACD/HCP4AQBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7209 ACD/HCP4AQBTA is decoded as follows:
- 7209: Basic series designation for a 45mm bore, 85mm OD angular contact ball bearing.
- A: Signifies a 25° contact angle, optimized for high axial load capacity.
- CD: Indicates a duplex bearing with a specific internal design and clearance.
- HC: Denotes the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4A: Specifies a super-precision tolerance class exceeding ABEC 7, ensuring minimal runout and vibration.
- QBT: Defines the matched set arrangement as a Quadruplex (4 bearings) in a Tandem Back-to-Back configuration.
- A (in QBTA): Indicates an Extra Light preload on the matched set.
7209 ACD/HCP4AQBTA Bearing Structural Features & Performance Benefits
- Extreme Rigidity and Load Capacity: The quadruplex QBT arrangement creates an exceptionally rigid bearing system, capable of handling high combined loads from multiple directions. The 25° contact angle further enhances axial load carrying capability.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers rotating mass and friction, enabling a high limiting speed of 41,000 rpm.
- Precision and Longevity: Manufactured to P4A tolerance standards, this bearing ensures minimal vibration and precise shaft positioning. The hybrid ceramic construction offers increased durability, reduced wear, and extended service life, especially in challenging environments.
- Thermal Stability: The phenolic cage provides excellent dimensional stability across the operating temperature range (-30°C to 110°C), maintaining performance under thermal expansion.
7209 ACD/HCP4AQBTA Bearing Typical Application Areas
This high-performance bearing is engineered for the most demanding applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Drives
- Aerospace Actuators and Control Systems
- Advanced Medical and Dental Equipment Spindles
