S71918 ACE/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71918 ACE/P4ADBA Bearing Product Overview & Core Advantages
The S71918 ACE/P4ADBA is a duplex back-to-back (DB) matched pair of precision angular contact ball bearings designed for exceptional performance in demanding applications. This P4A tolerance class bearing offers superior running accuracy, high rigidity, and the ability to accommodate combined loads (radial and bidirectional axial loads) simultaneously. Its compact design, featuring a phenolic cage and pre-filled grease, makes it ideal for high-speed, high-reliability machinery requiring minimal maintenance.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71918 | Basic bearing designation (18mm bore, 719 series) |
| ACE | 25° contact angle, optimized internal design |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Duplex Back-to-Back arrangement for high moment rigidity |
S71918 ACE/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system capable of withstanding heavy combined loads and significant moment loads. The 25° contact angle provides excellent axial load capacity in both directions.
High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, enabling operation at limiting speeds up to 15,000 rpm. The optimized internal geometry minimizes friction and heat generation.
Precision Operation: Manufactured to P4A tolerance class standards with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring smooth, quiet operation with minimal runout.
Sealed & Lubricated Design: The sealed construction with factory-applied grease lubrication provides long-term protection against contamination and extends service intervals in the specified temperature range (-30°C to 110°C).
S71918 ACE/P4ADBA Bearing Typical Application Areas
The S71918 ACE/P4ADBA is ideally suited for precision applications requiring high speed, rigidity, and accuracy, including:
- Machine tool spindles (CNC machining centers, grinding machines)
- High-frequency motor spindles
- Precision robotics and automation equipment
- Medical equipment (dental handpieces, surgical tools)
- Aerospace components and instrumentation
