71904 CEGA/HCPA9A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71904 CEGA/HCPA9A
Basic Information
System of measurement
Metric
Weight
0.032 kg
Tolerance class
PA9A
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
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1112 lbf
Radial static load rating
531 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
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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71904 CEGA/HCPA9A Bearing Product Overview & Core Advantages
The 71904 CEGA/HCPA9A is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the PA9A tolerance class, it delivers exceptional running accuracy and dimensional stability. A key advantage is its universal matchable (SU) design, allowing two bearings to be paired in a back-to-back (DB) or face-to-face (DF) arrangement to support combined radial and axial loads. The use of ceramic balls and a phenolic resin cage enables superior high-speed performance and reduced rotational mass. Pre-lubricated and designed for an extra light preload (Class A), it is ideal for spindles and other high-accuracy, high-RPM systems requiring minimal heat generation and friction.
71904 CEGA/HCPA9A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Benefit |
|---|---|---|
| CE | 15° Contact Angle | Optimized for high-speed operation with excellent axial load capacity. |
| GA | Extra Light Preload (Class A) | Minimizes runout and deflection, ensuring high rotational accuracy and smooth operation with low torque. |
| /HC | Hybrid Ceramic | Features ceramic balls (Si3N4) for lower density, higher stiffness, reduced heat generation, and extended service life at high speeds. |
| PA9A | Ultra-Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for the most demanding precision applications. |
71904 CEGA/HCPA9A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, enabling a limiting speed of 100,000 rpm (dmN value). This results in lower operating temperatures, reduced wear, and longer lubricant life.
- Phenolic Resin Cage: This lightweight, high-strength cage is ideal for high-speed applications, offering excellent dimensional stability and low friction under high centrifugal forces.
- Ultra-Precision Manufacturing: Manufactured to PA9A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing ensures minimal vibration and superior running accuracy.
- Universal Matchability (SU): Bearings are supplied as a matched set of 2 and are universal matchable, allowing for flexible mounting configurations (DB/DF) to create a rigid system capable of handling combined loads from any direction.
- Optimized Preload: The extra light preload (Class A) eliminates internal clearance, providing high system rigidity and precise shaft positioning without generating excessive heat or torque.
71904 CEGA/HCPA9A Bearing Typical Application Areas
This bearing is specifically designed for the most demanding high-speed and high-precision machinery, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high accuracy and responsiveness.
- Dental and Medical Handpieces: Where extreme speeds, reliability, and precision are critical.
- High-Frequency Spindles: PCB drilling and routing spindles.
- Aerospace Instrumentation: Gyroscopes and other precision navigation systems.
