708C
Miniature Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Performance
Materials
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708C Bearing Product Overview & Core Advantages
The 708C is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional performance. This precision bearing is distinguished by its ability to support combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its compact design, with a bore diameter of 8 mm and a width of just 7 mm, makes it an ideal solution for space-constrained, high-speed assemblies. Manufactured to ABEC-4 precision class, it ensures smooth operation, low noise, and high rotational accuracy, making it a cornerstone for high-reliability machinery.
708C Bearing Model Code Explained, Specifications & Naming Convention
| Model Suffix / Code | Technical Meaning |
|---|---|
| 708C | The base model number, defining the core bearing dimensions (8mm bore, 22mm OD, 7mm width). |
| Sealed / Open | Indicates the bearing is available in both sealed (for contaminant protection) and open (for direct lubrication access) variants. |
| SU | Universal Matchable arrangement, allowing bearings to be paired in any combination for duplex sets (e.g., DB, DF, DT) to adjust rigidity and load capacity. |
| Preload | Availability of preload options to eliminate internal clearance, resulting in enhanced system high rigidity and precise shaft positioning. |
708C Bearing Structural Features & Performance Benefits
The performance of the 708C is a direct result of its optimized design and material selection:
- High Rigidity and Load Capacity: The angular contact design with a 15° contact angle provides superior high rigidity, enabling the bearing to effectively manage combined loads. With a dynamic load rating of 755.33 lbf, it offers reliable performance under strenuous conditions.
- Exceptional High-Speed Performance: The availability of lightweight Nylon or Phenolic cages minimizes centrifugal forces, contributing to its remarkable grease limited speed of 62,000 r/min and oil limited speed of 66,000 r/min, classifying it as a true high-speed bearing.
- Material and Precision: Options for Steel or advanced Ceramic balls allow for customization based on application needs for speed, stiffness, and service life. The ABEC-4 rating guarantees tight tolerances for minimal runout and vibration.
- Versatile Lubrication & Sealing: The "Lubricated" and "Sealed/Open" options provide flexibility. Sealed versions offer protection against contaminants for extended service intervals, while open versions are ideal for systems with centralized lubrication.
708C Bearing Typical Application Areas
The 708C precision bearing is ideally suited for high-performance applications across various industries, including:
- High-Speed Spindles: CNC machining centers, grinding spindles, and PCB drilling machines.
- Precision Instrumentation: Optical encoders, medical devices, and laboratory equipment.
- Turbochargers and Small Turbomachinery: Where compact size and extreme rotational speeds are critical.
- Robotics and Automation: Joint actuators and high-precision gearboxes requiring high rigidity and responsiveness.
