728 CD/P4A
Miniature Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
728 CD/P4A
Basic Information
System of measurement
Metric
Weight
0.017 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
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
8
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
835 lbf
Radial static load rating
308 lbf
Limiting speed
110 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 103.8
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
728 CD/P4A Bearing Product Overview & Core Advantages
The 728 CD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate combined radial and axial loads simultaneously, this bearing features a 15° contact angle for optimal thrust capacity. Manufactured to P4 (ABEC-7) tolerance class, it delivers superior running accuracy, making it ideal for high-speed spindles and precision machinery where minimal runout and vibration are critical.
Model Code Breakdown
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 728 | Basic Series Code | Denotes the bearing series with specific bore diameter (8 mm), outside diameter (24 mm), and width (8 mm). |
| CD | Contact Angle & Preload | Indicates a 15° contact angle and the availability of a specific preload class for enhanced system rigidity. |
| P4A | Tolerance Class | Signifies a P4 (ABEC-7) precision grade, ensuring extremely tight dimensional and running tolerances for high-accuracy applications. |
728 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The single-row angular contact design with a 15° contact angle and available preload provides high axial and radial stiffness, minimizing deflection under load for superior positional accuracy.
- Optimized Load Capacity: Engineered to handle significant combined loads, efficiently supporting radial forces and thrust loads in one direction.
- High-Speed Capability: The lightweight phenolic resin cage ensures excellent stability and low friction, contributing to a high limiting speed of 110,000 rpm. The open design facilitates efficient lubrication management.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
728 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Rotary Systems: CNC rotary tables, indexing heads.
- High-Frequency Motors: Spindles for PCB drilling and routing.
- Medical & Laboratory Equipment: Centrifuges, high-speed scanners.
- Robotics: High-accuracy joints and actuators.
