709 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
709 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.013 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
9 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
10
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
806 lbf
Radial static load rating
360 lbf
Limiting speed
95 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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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709 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 709 CDGA/HCP4A is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As a single bearing with a 15° contact angle, it is optimized to handle combined loads, efficiently supporting both radial and axial forces. Its construction with ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life. Manufactured to a P4A tolerance class, this bearing is ideal for high-precision, high-rigidity applications where rotational accuracy is paramount.
709 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 709 CDGA/HCP4A can be broken down as follows to reveal its technical specifications:
- 709: Basic bearing series, indicating a metric, light series bearing with a 9mm bore.
- C: Signifies a 15° contact angle.
- DG: Indicates a Universal Matchable (SU) bearing. Two bearings can be universally matched in a duplex arrangement (back-to-back or face-to-face) to provide preload and enhance system rigidity.
- A: Denotes an Extra Light preload class.
- HCP4A: Defines the tolerance class. P4A represents a very high precision grade with tight dimensional and running accuracy tolerances.
709 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic (Si3N4) balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, enabling a very high limiting speed of 95,000 rpm. This makes it an exemplary high-speed bearing.
- Precision and Rigidity: Manufactured to ABEC 7 / P4A precision standards, this bearing ensures minimal runout and vibration. The 15° contact angle provides optimized axial load capacity while maintaining excellent radial load performance, contributing to overall system high rigidity.
- Reduced Heat Generation: Ceramic balls have a lower coefficient of thermal expansion than steel and are electrically insulating, which helps in reducing heat buildup and preventing electrical arcing in sensitive applications.
- Pre-lubricated for Immediate Use: The bearing comes lubricated from the factory, ensuring immediate installation and initial operation without the need for additional greasing.
709 CDGA/HCP4A Bearing Typical Application Areas
The 709 CDGA/HCP4A is engineered for the most demanding precision applications, including:
- High-Speed Spindles for CNC machining centers, grinding machines, and PCB drilling machines.
- Precision Instrumentation and medical devices.
- High-performance Robotics and automation systems.
- Advanced Aerospace and defense systems.
