728 CDGA/P4A
Miniature Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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728 CDGA/P4A Bearing Product Overview & Core Advantages
The 728 CDGA/P4A is a single row angular contact ball bearing designed for ultra-high precision and high-speed applications. Manufactured to P4A tolerance class, it delivers exceptional dimensional accuracy and running precision. Its key advantage lies in its ability to accommodate combined radial and axial loads simultaneously, making it an ideal choice for machine tool spindles and other demanding equipment requiring superior rotational accuracy and rigidity. The bearing is pre-lubricated and features a phenolic resin cage, contributing to its high-speed capability and smooth operation.
728 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 728 | Basic bearing series designation. |
| CD | Specifies a 15° contact angle, optimized for high-speed performance. |
| G | Indicates a Universal Matchable (SU) bearing, designed to be mounted in pairs (back-to-back, face-to-face, or tandem) to support combined loads. |
| A | Denotes an Extra Light preload (Class A), which minimizes runout and ensures high system rigidity. |
| P4A | The tolerance class, signifying very high precision for both dimensional and running accuracy. |
728 CDGA/P4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The combination of a 15° contact angle and a lightweight phenolic resin cage allows for a high limiting speed of 220,000 rpm (Grease), reducing centrifugal forces and heat generation.
- Superior Rigidity and Precision: The P4A tolerance class and extra light preload ensure minimal axial and radial play, providing exceptional running accuracy and system stiffness, which is critical for machining precision.
- Combined Load Capacity: As an angular contact ball bearing, it is engineered to support significant radial loads and one-directional axial loads simultaneously. Its Universal Matchable (SU) design allows for easy pairing to handle bidirectional axial loads and moment loads.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
728 CDGA/P4A Bearing Typical Application Areas
The 728 CDGA/P4A is specified for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instruments: Measuring devices and high-accuracy rotary tables.
- High-Frequency Motors and Spindles: Applications requiring minimal vibration and high rotational stability.
- Medical Equipment: Dental handpieces and other high-speed surgical tools.
