7205 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7205 CDGB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.11 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
52 mm
Outside diameter tolerance
-0.004mm to 0
Width
15 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3038 lbf
Radial static load rating
1620 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
4
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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7205 CDGB/HCP4A Bearing Product Overview & Core Advantages
The 7205 CDGB/HCP4A is a single row angular contact ball bearing designed for exceptional precision and performance. Engineered to a P4A super precision tolerance class, it is optimized for applications requiring high running accuracy and system rigidity. Its key advantages include the ability to accommodate combined radial and axial loads in one direction, superior high-speed capabilities facilitated by its phenolic cage and ceramic balls, and a universal matching design that simplifies preload setting in multi-bearing arrangements. This bearing is pre-lubricated and ready for installation, making it an ideal choice for high-reliability, demanding machinery.
7205 CDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7205 CDGB/HCP4A is decoded as follows:
- 7205: Basic series designation for a single row angular contact ball bearing with a 25mm bore and 52mm outside diameter.
- C: Denotes a 15° contact angle, optimized for high-speed applications requiring high axial load capacity.
- D: Indicates the bearing is filled with a standard grease lubrication.
- GB: Specifies a Light preload / Class B. This preload eliminates internal clearance, enhancing system rigidity and rotational accuracy.
- HC: Signifies the use of Hybrid Ceramic components, specifically ceramic balls and a steel ring. This reduces friction, heat generation, and allows for higher speeds.
- P4A: Represents a super precision tolerance class exceeding ABEC 7. This ensures extremely tight dimensional and running accuracy for the most demanding applications.
7205 CDGB/HCP4A 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 extends service life, especially under high-speed conditions. This also provides inherent electrical insulation.
- Phenolic Resin Cage: The lightweight and robust phenolic (resin) cage contributes to excellent acceleration and deceleration characteristics, low noise operation, and is well-suited for high rotational speeds.
- Super Precision P4A Tolerances: With bore, outside diameter, and width tolerances held to extremely tight limits (e.g., bore: -0.004mm to 0), this bearing guarantees superior running accuracy, minimal vibration, and enhanced positional stability of the shaft.
- Universal Matchable Design (SU): Bearings are manufactured to universal matching standards, allowing any bearing to be paired with another without selective assembly to achieve a specific preload or clearance in a duplex set (Back-to-Back or Face-to-Face).
- Optimized Performance Ratings: With a dynamic load rating of 3038 lbf and a limiting speed of 100,500 rpm, this bearing is built to handle significant loads at very high rotational velocities.
7205 CDGB/HCP4A Bearing Typical Application Areas
The 7205 CDGB/HCP4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors and generators operating at extreme speeds.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
