S7204 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7204 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.092 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
11
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2678 lbf
Radial static load rating
1316 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Grease
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
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In Stock
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S7204 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S7204 CDGA/HCP4A is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. Designed to simultaneously handle combined radial and axial loads from both directions, its compact design integrates two single-row bearings into one unit, saving space and simplifying assembly. Manufactured to super-precision P4A tolerance class and featuring a phenolic cage with ceramic balls, this bearing delivers superior high-speed performance, reduced friction, and extended service life, making it ideal for high-reliability, precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7204 | Basic bearing series, indicating a double row angular contact ball bearing with a 20mm bore. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| DG | Indicates a Universal Matchable (SU) design. Two bearings are supplied as a pre-matched set for precise axial preload and optimal performance. |
| A | Denotes an Extra Light preload (Class A), minimizing friction and heat generation for the highest speeds. |
| HCP4A | Defines the bearing's material and precision: Hybrid Ceramic balls (HC) and super-precision P4A tolerance class. |
S7204 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides superior radial and axial stiffness, enabling stable support under combined loads. The 15° contact angle effectively manages bidirectional axial forces.
- Exceptional High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls (Hybrid) significantly reduces centrifugal forces, allowing for a high limiting speed of 75,000 rpm. This also results in lower operating temperatures.
- Precision & Longevity: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The sealed construction retains factory-applied grease lubrication and protects against contamination, ensuring consistent performance and a long, maintenance-free service life within a temperature range of -30°C to 110°C.
S7204 CDGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Instrumentation: Measuring devices, optical scanners, and laboratory equipment.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Advanced Robotics: High-accuracy joints and actuators requiring minimal backlash.
