71902 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71902 ACE/HCP4A
Basic Information
System of measurement
Metric
Weight
0.013 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
15 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
28 mm
Outside diameter tolerance
-0.005mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
12
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
691 lbf
Radial static load rating
290 lbf
Limiting speed
127 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 132.77
/ each
In Stock
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71902 ACE/HCP4A Bearing Product Overview & Core Advantages
The 71902 ACE/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional speed performance. Its design is optimized to handle significant combined loads—simultaneous radial and axial loads—in one direction. A key advantage is its P4 (ABEC-7) tolerance class, ensuring minimal runout and superior rotational accuracy. The combination of a ceramic ball material and a phenolic cage contributes to lower friction, reduced weight, and the capability for higher limiting speeds, making it an ideal choice for high-performance, high-reliability systems.
71902 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing designation, indicating a metric, ultra-light series angular contact bearing. |
| ACE | Signifies a 25° contact angle and optimized internal geometry for high-speed operation. |
| HC | Indicates the use of Hybrid Ceramic balls (silicon nitride). |
| P4 | Denotes the tolerance class, equivalent to ABEC-7, for ultra-precise applications. |
| A | Indicates that the bearing is supplied with a specific preload for enhanced rigidity. |
71902 ACE/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls with a steel ring provides superior performance, including higher speed capability, reduced heat generation, and extended service life due to ceramic's lower density and non-conductive properties.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent guidance for the ceramic balls, contributing to smooth operation and stability at very high rotational speeds (127,000 rpm).
- 25° Contact Angle & Preload: The 25° contact angle is optimized for handling substantial axial loads. The factory-applied preload ensures maximum stiffness and precise shaft positioning, minimizing deflection under load.
- Precision Engineering: Manufactured to a P4 tolerance class, this bearing guarantees exceptional running accuracy, low vibration, and consistent performance in the most demanding high-speed and precision applications.
71902 ACE/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-tech, high-speed machinery, including:
- High-Frequency Spindles for CNC machining centers and PCB drilling machines
- Precision Grinding Spindles
- High-Speed Motors and turbo-molecular pumps
- Medical and Dental Handpieces
- Aerospace Instrumentation and guidance systems
