708AC
Miniature Angular Contact Ball Bearings
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708AC Bearing Product Overview & Core Advantages
The 708AC is a miniature angular contact ball bearing engineered for applications demanding high precision and exceptional speed capabilities. This bearing is specifically designed to handle combined loads, efficiently supporting both radial and axial forces in one direction. Its compact design, with a 7mm width and 8mm bore, makes it ideal for space-constrained, high-performance assemblies where reliability and high rigidity are paramount.
708AC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 708 | Basic bearing series designation, indicating a specific internal geometry and bearing size. |
| AC | Angular Contact design, signifying a 25° contact angle optimized for high axial load capacity. |
Note: The 708AC is available in various configurations, including Sealed or Open types, and with different cage and ball materials (e.g., Nylon or Phenolic cage, Steel or Ceramic balls), which are typically specified with additional suffixes.
708AC Bearing Structural Features & Performance Benefits
- High-Speed Performance: Engineered for ultra-high rotational speeds, achieving a grease limited speed of 62,000 r/min and an oil limited speed of 95,000 r/min. This is facilitated by optimized internal geometry and the potential use of lightweight, low-friction cages.
- High Rigidity & Load Capacity: The angular contact design with a 25° contact angle provides robust support against combined loads, ensuring stable operation and high system rigidity.
- Precision Engineering: Manufactured to ABEC-4 precision class tolerances, guaranteeing running accuracy, reduced vibration, and consistent performance in demanding applications.
- Flexible Configuration: The bearing is Universal Matchable (SU), allowing two bearings to be paired in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to optimize load distribution and stiffness for specific application needs. Preload options are also available for further enhancing rigidity.
708AC Bearing Typical Application Areas
- High-Speed Spindles for PCB Drilling and CNC Micro-Machining
- Precision Instrumentation and Optical Encoders
- Turbochargers and Small High-Speed Compressors
- Medical and Dental Handpieces
- High-Performance Small Motors and Robotics
