71905 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.036 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
42 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
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1186 lbf
Radial static load rating
630 lbf
Limiting speed
83 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
No drawings available at the moment, will be launched soon
Price:
$ 126.77
/ each
In Stock
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71905 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71905 CEGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. Engineered to accommodate combined loads (radial and axial) simultaneously, this bearing features a single-row design with a 15° contact angle, optimized for high-speed operation. Its core advantages include superior running accuracy due to the P4A tolerance class, high rigidity, and the ability to be universally matched (SU) in pairs for preload control. The use of ceramic balls and a phenolic cage contributes to reduced weight, lower friction, and enhanced durability in demanding environments.
71905 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 9mm width) |
| CE | Enhanced internal design for improved performance |
| GA | Preload level: Extra light (Class A) |
| HCP4A | Tolerance class: P4A (high precision), Universal Matchable (SU) |
71905 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on bore, outside diameter, and width, ensuring minimal runout and superior system stability.
- High-Speed Capability: The combination of a lightweight phenolic resin cage, ceramic balls (Si3N4), and a 15° contact angle enables a very high limiting speed of 83,000 rpm, minimizing centrifugal forces and operational heat.
- Advanced Material Composition: Ceramic balls offer advantages including electrical insulation, lower density for reduced centrifugal load, higher hardness for extended life, and superior performance in lubricant-starved conditions.
- Universal Matching (SU): Bearings are supplied as a universally matchable set of 2, allowing for flexible mounting arrangements to achieve the desired preload and rigidity in the application without selective pairing.
- Open Seal & Pre-lubrication: The open seal type is suitable for systems with centralized lubrication, while the bearing comes pre-lubricated for immediate operation.
71905 CEGA/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance applications such as:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- High-Frequency Spindles: In PCB drilling and precision engraving machines.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and other critical control mechanisms.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Robotics: Precision joints and actuators where high speed and low friction are critical.
