7203 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7203 CDGB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.054 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
40 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
10
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2077 lbf
Radial static load rating
934 lbf
Limiting speed
103 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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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7203 CDGB/HCP4A Bearing Product Overview & Core Advantages
The 7203 CDGB/HCP4A is a single-row angular contact ball bearing designed for applications demanding exceptional precision and high-speed performance. Engineered to accommodate combined loads (radial and axial loads in one direction), this bearing features a 15° contact angle and is supplied as a Universal Matchable (SU) set, enabling precise preload control when mounted in pairs. Its core advantages include superior high-speed capability facilitated by a phenolic cage and ceramic balls, outstanding dimensional stability ensured by P4A super-precision tolerance, and reliable operation across a wide temperature range.
7203 CDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7203 | Basic bearing series, indicating a metric, single-row angular contact design with a 17mm bore, 40mm OD, and 12mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| DGB | Indicates a Universal Matchable (SU) bearing. Two such bearings can be mounted in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to achieve a specific preload. |
| HC | Refers to the use of Hybrid Ceramic components, specifically ceramic balls, which reduce centrifugal forces, lower operating temperatures, and enable higher limiting speeds. |
| P4A | Denotes a super-precision tolerance class exceeding ABEC 7, ensuring extremely tight dimensional and running accuracy for the most demanding applications. |
7203 CDGB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of ceramic balls and steel rings significantly reduces friction and heat generation. This results in a higher limiting speed (103,000 rpm), extended service life, and improved reliability in high-velocity spindles.
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance at high speeds, contributing to smooth operation and reduced vibration.
- Super-Precision P4A Tolerance: With extremely tight bore, outer diameter, and width tolerances, this bearing ensures minimal runout and superior rotational accuracy, which is critical for maintaining precision in machining and measurement.
- Universal Matching (SU): The bearing is supplied pre-lubricated and is Universal Matchable, allowing for simplified assembly of preloaded pairs without selective matching, reducing installation time and complexity.
- High Rigidity & Load Capacity: The angular contact design and 15° contact angle provide high rigidity and the ability to support significant combined loads, with a dynamic load rating of 2077 lbf.
7203 CDGB/HCP4A Bearing Typical Application Areas
The 7203 CDGB/HCP4A is ideally suited for high-performance machinery where speed, precision, and rigidity are paramount. Key application areas include:
- High-Speed Machine Tool Spindles: CNC milling, grinding, and drilling spindles.
- Precision Rotary Systems: High-frequency motors, encoder systems, and measuring instruments.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units (APUs).
- Semiconductor Manufacturing Equipment: Wafer handling robots and precision stages.
