708 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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708 ACE/HCP4A Bearing Product Overview & Core Advantages
The 708 ACE/HCP4A is a single-row angular contact ball bearing engineered for high-precision and high-speed applications. Its defining characteristic is the 25° contact angle, optimized to support significant combined loads—handling both radial and axial forces simultaneously with high efficiency. Manufactured to the exacting P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy and rotational stability. The combination of a phenolic resin cage and ceramic balls contributes to lower friction, reduced weight, and superior performance at the limiting speed of 180,000 rpm, making it an ideal choice for demanding, high-rotation scenarios.
708 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance & Benefit |
|---|---|---|
| 708 | Basic Bearing Series/Size | Defines the core dimensions: 8mm bore, 22mm OD, 7mm width. |
| ACE | Angular Contact, 25° Contact Angle | Optimized for handling combined radial and axial loads efficiently. |
| HC | Hybrid Ceramic (Ceramic Balls) | Enables higher speed capability, reduced friction, and longer service life. |
| P4A | P4 (ABEC-7) Tolerance Class | Ensures ultra-precise dimensions and runout for high-accuracy applications. |
708 ACE/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic (silicon nitride) balls with a steel ring significantly reduces centrifugal forces, lowers operating temperature, and provides excellent electrical insulation, enabling superior high-speed performance.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction at high speeds, contributing to the bearing's high limiting speed and smooth operation.
- Precision Engineering (P4): Manufactured to P4 tolerance class, this bearing provides minimal runout and vibration, which is critical for applications requiring high rotational accuracy and system rigidity.
- Optimized Load Capacity: The 25° contact angle is engineered to provide an excellent balance between radial and axial load carrying capacity, making it suitable for applications with complex loading conditions.
708 ACE/HCP4A Bearing Typical Application Areas
- High-Speed Spindles for CNC machining centers and PCB drilling machines
- Precision Instrumentation and medical device motors
- Robotic Arm Drives and servo motors
- Aerospace Actuators and auxiliary power units
