708 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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708 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 708 ACDGA/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Its defining feature is the 25° contact angle and ceramic ball construction, enabling superior performance under combined radial and axial loads. Manufactured to P4A tolerance class, this bearing delivers extremely tight dimensional control for demanding machinery. The phenolic resin cage and universal matchable (SU) design further enhance its suitability for high-speed spindle arrangements and other precision engineering applications where rigidity and minimal thermal expansion are critical.
708 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Implication |
|---|---|---|
| 708 ACDGA | Basic bearing designation with specific internal geometry (25° contact angle). | Defines the core bearing type and its load-carrying characteristics. |
| H | Indicates the bearing is supplied lubricated. | Ensures immediate operational readiness and initial protection. |
| C | Specifies the use of ceramic (Si3N4) balls. | Enables higher speeds, reduced friction, and longer service life. |
| P4A | Denotes an ultra-precision tolerance class. | Guarantees extremely tight running accuracy for high-performance spindles. |
708 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- Ceramic Ball & Phenolic Cage for High-Speed Operation: The combination of silicon nitride (Si3N4) balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, allowing the bearing to achieve its impressive limiting speed of 110,000 rpm. This design also offers excellent dimensional stability under thermal stress.
- Precision Ground to P4A Tolerance: All bearing dimensions, including the 8 mm bore and 22 mm outside diameter, are manufactured to the strictest P4A tolerances. This results in minimal runout and vibration, which is paramount for achieving superior surface finishes in machining applications.
- Optimized for Combined Loads: The 25° contact angle is engineered to efficiently support significant axial loads in one direction in addition to radial loads, providing excellent rigidity in the application.
- Universal Matchable (SU) Design: This bearing is designed for universal matching, allowing two bearings to be mounted in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement without selective assembly. This simplifies preloading and setup in complex spindle configurations.
708 ACDGA/HCP4A Bearing Typical Application Areas
The 708 ACDGA/HCP4A is ideally suited for ultra-high-speed and high-precision machinery where accuracy and reliability are non-negotiable. Key industries and equipment include:
- High-Frequency CNC Spindles for PCB drilling, precision grinding, and micromachining.
- Dental and Medical Handpieces requiring extreme speeds and smooth operation.
- Turbochargers and Small High-Speed Compressors.
- Precision Instrumentation and laboratory equipment.
