728 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
728 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.015 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.005mm to 0
Width
8 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
8
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
806 lbf
Radial static load rating
302 lbf
Limiting speed
120 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:
$ 103.72
/ each
In Stock
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728 ACD/HCP4A Bearing Product Overview & Core Advantages
The 728 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and high-speed performance. As a single-row bearing, it is designed to accommodate primarily axial loads in one direction and combined loads. Its key advantages stem from its P4 (ABEC-7) tolerance class, ceramic ball material, and phenolic cage, which collectively deliver superior speed capability, rigidity, and thermal stability for the most demanding precision machinery.
728 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| ACD | Indicates a 25° contact angle design, optimized for supporting high axial loads. |
| HCP4A | Denotes a P4 (ABEC-7) tolerance class and signifies that the bearing is supplied pre-lubricated and ready for installation. |
728 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The combination of ceramic (Si3N4) balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 120,000 rpm.
- High Rigidity & Precision: Manufactured to P4 precision class with a 25° contact angle, this bearing provides excellent running accuracy and stiffness, minimizing deflection under load.
- Thermal Stability: The phenolic cage offers superior dimensional stability across the operating temperature range (-30°C to 110°C), ensuring consistent performance.
- Preload & Matched Sets: The bearing is supplied with a preload, enhancing system rigidity and rotational accuracy. While this is a single bearing, angular contact bearings can be arranged in tandem or back-to-back configurations for increased load capacity.
728 ACD/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Aerospace & Defense Instrumentation
- Semiconductor Manufacturing Equipment
