71904 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71904 CDGB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.033 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1361 lbf
Radial static load rating
720 lbf
Limiting speed
100 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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71904 CDGB/HCP4A Bearing Product Overview & Core Advantages
The 71904 CDGB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. As a P4A tolerance class bearing with a 15° contact angle, it is optimized to handle combined radial and axial loads simultaneously. Its light preload (Class B) ensures minimal runout and smooth operation, making it ideal for high-speed spindles and precision instruments. The combination of a phenolic cage and ceramic balls contributes to lower friction, reduced weight, and superior high-speed performance, achieving a limiting speed of 100,000 rpm.
71904 CDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD, 9mm width). |
| C | 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| DGB | Universal Matchable (SU) bearing. Two bearings can be universally matched in a set to provide preload and precise axial rigidity. |
| HC | Hybrid Ceramic: Features ceramic balls (typically silicon nitride) for reduced centrifugal force, lower friction, and higher speed capability. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy for critical applications. |
71904 CDGB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls significantly reduces rolling element density and mass, leading to lower centrifugal forces and less friction at high speeds. This directly enables the bearing to achieve its high limiting speed of 100,000 rpm.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction characteristics, further supporting high-speed operation and smooth running.
- Universal Matchable Design (SU): The DGB suffix indicates that this bearing is manufactured to be universally matchable. Two identical bearings can be paired in a matched set to create a preloaded arrangement, enhancing system rigidity and rotational accuracy without selective assembly.
- Precision & Preload: Manufactured to P4A tolerance class with a light preload (Class B), this bearing minimizes axial and radial play, resulting in superior positional accuracy, reduced vibration, and high stiffness for demanding applications.
71904 CDGB/HCP4A Bearing Typical Application Areas
- High-Speed Machine Tool Spindles: CNC milling, grinding, and drilling spindles where precision, speed, and rigidity are paramount.
- Precision Instrumentation: High-resolution encoders, measuring devices, and optical scanners.
- Semiconductor Manufacturing Equipment: Wafer handling robots and precision stages.
- High-Frequency Motors and Turbomachinery: Applications requiring reliable operation at extreme rotational speeds.
