718/5AC
Miniature Angular Contact Ball Bearings
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Part No.
Part No.
718/5AC
Basic Information
System of measurement
Metric
ABEC rating
P5(ABEC-5),P4(ABEC-11)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
5 mm
Outside diameter
11 mm
Width
5 mm
Contact angle
25 °
Performance
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Preload
Available
Materials
Ball material
Steel,Ceramic
Cage material
Nylon,Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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718/5AC Bearing Product Overview & Core Advantages
The 718/5AC is a double row angular contact ball bearing engineered for applications requiring exceptional precision and reliability. This compact bearing is designed to accommodate combined loads—simultaneously handling substantial radial loads and bidirectional axial loads. Its double row construction provides high rigidity, making it an ideal solution for high-precision spindles and mechanisms where minimal deflection is critical. Available in various configurations including sealed and open versions, and with options for preload, it offers design flexibility for demanding applications.
718/5AC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 718 | Bearing series, indicating a double row angular contact ball bearing with a 15° contact angle. |
| 5 | Bore diameter of 5 mm. |
| AC | Angular Contact design, optimized for combined loads. |
| (Sealed/Open) | Configuration option: Sealed for contaminant protection or Open for custom lubrication. |
| (P5/P4) | Precision class (ABEC-5 or ABEC-11), denoting very high running accuracy. |
718/5AC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides superior radial and axial stiffness, enabling stable performance under combined loads. The 25° contact angle is optimized for supporting significant axial loads in both directions.
- Precision & High-Speed Performance: Manufactured to ABEC P5/P4 precision grades, this bearing ensures minimal runout and vibration. Options for nylon or phenolic cages contribute to lower friction, reduced weight, and suitability for high-speed applications.
- Material & Configuration Flexibility: The availability of steel or ceramic balls allows for selection based on speed, stiffness, and corrosion resistance requirements. The bearing is Universal Matchable (SU), allowing two bearings to be paired for optimized preload and performance.
- Versatile Lubrication & Sealing: The lubricated and optional sealed versions ensure long-term, maintenance-free operation by retaining lubricant and excluding contaminants.
718/5AC Bearing Typical Application Areas
This precision bearing is ideally suited for:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Electric Spindles
- Medical and Dental Handpieces
- High-Performance Robotics and Automation
- Optical and Measuring Instrument Rotational Units
