7209 ACD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7209 ACD/HCP4ADBC
Basic Information
System of measurement
Metric
Weight
0.68 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
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
14918 lbf
Radial static load rating
13500 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7209 ACD/HCP4ADBC Bearing Product Overview & Core Advantages
The 7209 ACD/HCP4ADBC is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) pair is preloaded to Moderate / Class C, providing superior system stiffness and minimizing axial and radial runout. Its construction, featuring ceramic balls and a phenolic cage, is optimized for high-speed operation up to 41,000 rpm. This bearing is engineered to handle combined loads (radial and axial) simultaneously with high reliability, making it ideal for critical, high-performance machinery.
7209 ACD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series and size designation (45mm bore, 85mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies the bearing is part of a Duplex (paired) set. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4A | Denotes a high-precision tolerance class (superior to ABEC 7). |
| DB | Specifies the Back-to-Back mounting arrangement of the paired set. |
| C | Indicates a Moderate preload is applied to the duplex set. |
7209 ACD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back (DB) duplex arrangement creates a wide effective spread of the load-carrying contact angles, significantly increasing moment stiffness and operational stability under complex loading conditions.
- Superior High-Speed Performance: The combination of low-density ceramic balls reduces centrifugal forces and the lightweight phenolic cage ensures minimal friction and excellent guidance at the limiting speed of 41,000 rpm.
- Enhanced Load Capacity: The 25° contact angle and duplex preload provide excellent capacity for combined radial and axial loads, with a dynamic load rating of 14,918 lbf and a static load rating of 13,500 lbf.
- Precision & Longevity: Manufactured to P4A tolerance class, this bearing ensures minimal runout for precise positioning. The open design allows for customized lubrication schemes to maximize service life in demanding environments.
7209 ACD/HCP4ADBC Bearing Typical Application Areas
This high-precision, high-speed bearing is specifically designed for advanced applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and high-speed milling heads.
- High-Frequency Motors & Spindles: Used in electric vehicle drivetrains, precision robotics, and dental handpieces.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and auxiliary power units (APUs).
- Precision Instrumentation: For coordinate measuring machines (CMM) and optical scanning equipment.
