S71918 ACB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71918 ACB/P4A Bearing Product Overview & Core Advantages
The S71918 ACB/P4A is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a single-row bearing with a 25° contact angle, it excels at supporting combined loads—simultaneously handling significant radial loads and axial loads in one direction. Manufactured to the stringent P4 (ABEC-7) tolerance class, it offers superior running accuracy. Its sealed design and factory-applied lubrication ensure long-term performance with minimal maintenance, making it ideal for high-speed and high-rigidity applications.
S71918 ACB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71918 | Basic bearing designation, indicating a metric series, 90mm bore, 125mm OD, 18mm width angular contact ball bearing. |
| ACB | Signifies a 25° contact angle and that the bearing is supplied with a preload for enhanced rigidity and precise shaft positioning. |
| P4A | Denotes the P4 (ABEC-7) tolerance class, representing very high precision levels for running accuracy and dimensional stability. |
S71918 ACB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and factory-applied preload work in tandem to provide exceptional system stiffness, minimizing deflection under load and ensuring precise rotational accuracy critical for machine tool spindles and other high-precision equipment.
- Optimized Load Capacity: Engineered to handle combined radial and axial loads efficiently. With a dynamic load rating of 3780 lbf and a static load rating of 3735 lbf, it offers reliable performance in demanding conditions.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 12,000 rpm. This makes the bearing suitable for high-speed spindle applications.
- Sealed and Lubricated for Longevity: The sealed design effectively excludes contaminants. Combined with factory-applied lubrication, this creates a maintenance-free solution for the bearing's service life within its specified temperature range of -30°C to 110°C.
S71918 ACB/P4A Bearing Typical Application Areas
The S71918 ACB/P4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors and Spindles: Where minimal runout and vibration are critical.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Robotics and Automation: Precision rotary joints and arm linkages.
