718/8AC
Miniature Angular Contact Ball Bearings
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718/8AC Bearing Product Overview & Core Advantages
The 718/8AC is a precision angular contact ball bearing designed for applications demanding high rotational accuracy and rigidity. Engineered to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 25° contact angle for optimal axial load capacity. Available in both sealed and open variants, it is offered with high-precision ABEC P5/P4 grades and optional ceramic balls for enhanced performance in high-speed and demanding operational environments. Its compact bearing dimensions (8mm bore, 16mm OD, 5mm width) make it ideal for space-constrained, high-precision assemblies.
718/8AC Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Code | Technical Meaning |
|---|---|---|
| Series | 718 | Ultra-lightweight series with thin cross-section |
| Bore Diameter | 8 | 8 mm bore diameter |
| Design | AC | Angular Contact design with 25° contact angle |
| Seal Type | Sealed/Open | Available with contact seals for contamination protection or open for high-speed applications |
| Preload | Available | Can be supplied with preload for enhanced rigidity and reduced axial/radial play |
| Arrangement | Universal Matchable (SU) | Bearings can be universally paired in any combination for duplex mounting (DB, DF, DT) |
718/8AC Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The angular contact design, combined with available preload and high-precision ABEC P5/P4 tolerances, ensures exceptional running accuracy and system stiffness, minimizing deflection under load.
Superior Load Capacity: The 25° contact angle is optimized to handle significant combined loads, making it suitable for applications with substantial axial and radial force components.
High-Speed Capability: Options for lightweight nylon or phenolic cages and low-friction ceramic balls significantly reduce centrifugal forces, enabling higher limiting speeds and lower operating temperatures.
Versatile & Long-Lasting: The Universal Matchable (SU) designation simplifies mounting and arrangement in duplex pairs. Sealed versions are pre-lubricated for maintenance-free operation, protecting against contamination.
718/8AC Bearing Typical Application Areas
- High-Speed Spindles for CNC machining centers and precision grinding machines
- Precision Instrumentation and medical devices requiring high accuracy and quiet operation
- Robotic Arms & Actuators where compact size, rigidity, and reliability are critical
- High-Frequency Motors and servo drives
- Aerospace & Defense guidance systems and avionics
