718/7AC
Miniature Angular Contact Ball Bearings
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Basic Information
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718/7AC Bearing Product Overview & Core Advantages
The 718/7AC series represents a premium line of miniature angular contact ball bearings engineered for high-precision applications. These precision bearings are specifically designed to handle combined loads—simultaneously supporting significant radial loads and axial loads in one direction. Their compact design, with a 7mm bore, 14mm OD, and 5mm width, makes them ideal for space-constrained, high-speed assemblies requiring exceptional running accuracy and high rigidity. Available in both sealed and open configurations with various preload options, they deliver reliable performance in demanding operational environments.
718/7AC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 718/7 | Series designation and bore diameter code (7 mm) |
| AC | Angular Contact design (25° contact angle) |
| Sealed / Open | Configuration option: Sealed for contamination protection or Open for high-speed re-lubrication |
| P5 / P4 | ABEC precision class: P5 (ABEC-5) or P4 (ABEC-15) for superior running accuracy |
| SU | Universal Matchable arrangement for flexible mounting configurations |
718/7AC Bearing Structural Features & Performance Benefits
The performance of the 718/7AC is defined by its sophisticated engineering. The angular contact design with a 25° contact angle is optimized to handle combined loads efficiently. The availability of preload options enhances system stiffness and minimizes axial and radial play, critical for applications requiring high positional accuracy. Choice of cage material—Nylon for reduced friction and quiet operation or Phenolic for higher temperature capability—directly contributes to its high-speed performance. When configured with ceramic balls, the bearing achieves even higher speed capability, reduced weight, and superior non-conductive properties. The sealed versions are lubricated for life, offering a maintenance-free solution by effectively shielding contaminants and retaining grease.
718/7AC Bearing Typical Application Areas
- High-Speed Spindles in PCB drilling and milling machines
- Precision Instrumentation and optical encoders
- Medical Device Motors and dental handpieces
- Robotic Actuators and small precision gearboxes
- Semiconductor Handling equipment
