S71918 ACD/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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S71918 ACD/P4A Bearing Product Overview & Core Advantages
The S71918 ACD/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. As a P4 (ABEC-7) tolerance class bearing, it is designed to handle significant combined loads, accommodating both radial and substantial one-directional axial loads due to its 25° contact angle. Its compact design, featuring a phenolic cage and factory-applied lubrication, makes it an ideal choice for high-speed spindles and other precision machinery where rigidity and low operational noise are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71918 | Basic bearing designation for a 90mm bore, 125mm OD, 18mm width angular contact ball bearing. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high rigidity design and internal optimization. |
| P4A | Specifies the P4 (ABEC-7) precision tolerance class, denoting extremely tight dimensional and running accuracy. |
S71918 ACD/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and vibration. The optimized internal geometry and 25° contact angle provide high axial and radial stiffness, essential for maintaining accuracy under load.
- Superior Load Capacity: With a dynamic load rating of 9945 lbf and a static load rating of 10800 lbf, it is engineered to handle demanding combined loads in high-performance applications.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the pre-lubrication and precision-ground components enable a high limiting speed of 8,500 rpm.
- Sealed & Lubricated for Longevity: The bearing is sealed to protect against contamination and is pre-lubricated for immediate use, offering reliable operation within a temperature range of -30°C to 110°C.
S71918 ACD/P4A Bearing Typical Application Areas
The S71918 ACD/P4A is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Medical and Dental Equipment
- Aerospace Instrumentation
