S71918 ACE/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71918 ACE/P4A Bearing Product Overview & Core Advantages
The S71918 ACE/P4A is a single-row angular contact ball bearing engineered for precision applications requiring exceptional rotational accuracy and high-speed capability. As a P4 (ABEC-7) tolerance class bearing, it delivers superior running accuracy, making it ideal for high-precision spindles and machinery. Its key advantage lies in its ability to support combined loads (radial and axial) simultaneously, with the 25° contact angle optimized for high axial load capacity. The bearing comes pre-lubricated and is available with a preload, ensuring immediate high rigidity and reduced vibration upon installation.
S71918 ACE/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71918 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 90mm bore, 125mm OD, and 18mm width. |
| ACE | Internal design code specifying a 25° contact angle and optimized internal geometry. |
| P4A | Indicates the P4 (ABEC-7) tolerance class for exceptional dimensional and running accuracy. The "A" suffix denotes specific accuracy and preload requirements. |
S71918 ACE/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class with a phenolic resin cage, this bearing ensures minimal runout and high rotational accuracy. The availability of preload further enhances system rigidity and minimizes axial and radial play.
- Superior Load Capacity: The 25° contact angle is engineered to handle significant combined radial and axial loads efficiently, providing reliable performance in demanding applications.
- High-Speed Performance: The lightweight and robust phenolic cage, combined with high-grade chrome steel components, enables a high limiting speed of 13,000 rpm, making it suitable for high-speed spindles.
- Ready-to-Use & Durable: The bearing is pre-lubricated and sealed, protecting against contamination and providing long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S71918 ACE/P4A Bearing Typical Application Areas
The S71918 ACE/P4A is designed for high-precision, high-speed rotational systems. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces, centrifuges, and imaging device rotors.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
