7209 CD/HCP4ADGB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7209 CD/HCP4ADGB
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
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
15795 lbf
Radial static load rating
13950 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7209 CD/HCP4ADGB Bearing Product Overview & Core Advantages
The 7209 CD/HCP4ADGB is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing is designed to accommodate combined loads—simultaneously handling significant radial and axial loads in both directions. Its P4A tolerance class ensures ultra-precise running accuracy, while the ceramic ball and phenolic cage construction contribute to superior high-speed capability and reduced weight. Pre-lubricated and featuring a light preload (Class B), it offers immediate, reliable operation with high rigidity, making it ideal for high-speed spindles and precision machinery.
7209 CD/HCP4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series and size designation (45mm bore, 85mm OD). |
| CD | Contact angle of 15° and high-precision construction. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for enhanced speed and durability. |
| P4A | Ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards for running accuracy and dimensional stability. |
| DGB | Universal Matchable (SU): Bearings are supplied as a matched set of 2 and can be arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations. |
7209 CD/HCP4ADGB Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds (41,000 rpm). Ceramic's inherent properties also provide superior resistance to wear and electrical arcing.
- High Rigidity & Load Capacity: The 15° contact angle and precision grinding provide excellent stability and rigidity, capable of handling high dynamic and static load ratings (15,795 lbf / 13,950 lbf). The universal matchable design allows for preloading in any configuration to further increase system stiffness.
- Optimized High-Speed Performance: The lightweight phenolic resin cage offers excellent strength and guidance at high speeds, while the hybrid construction minimizes friction and heat generation, directly contributing to the bearing's exceptional limiting speed.
- Precision & Reliability: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications requiring extreme rotational accuracy. The light preload eliminates internal clearance for precise shaft positioning right from installation.
7209 CD/HCP4ADGB Bearing Typical Application Areas
This high-performance bearing is specifically designed for advanced machinery where speed, precision, and reliability are paramount. Key application areas include:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and drilling centers.
- Precision Robotics: In high-accuracy robotic arms and joints.
- High-Speed Motors and Drives: Especially in electric motors and frequency-controlled drives.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and auxiliary power units (APUs).
- Medical Equipment: For dental handpieces and high-speed imaging scanners.
