S71904 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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S71904 ACD/P4A Bearing Product Overview & Core Advantages
The S71904 ACD/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. This single-row bearing excels at accommodating combined loads, efficiently handling both radial forces and substantial axial loads in one direction. Manufactured to the stringent P4 (ABEC-7) tolerance class, it guarantees minimal runout and superior rotational accuracy. Its compact cross-section, combined with a 25° contact angle and available preload, makes it an ideal solution for high-speed spindles and other precision machinery where high rigidity and operational reliability are paramount.
Model Code In-Depth Analysis
| Code Segment | Technical Meaning |
|---|---|
| S | Designates a super-precision bearing series. |
| 7 | Indicates an angular contact ball bearing. |
| 1904 | Denotes the bearing size: 20mm bore, 37mm OD, 9mm width. |
| ACD | Specifies a 25° contact angle and is designed for a matched arrangement (Duplex). |
| P4A | Defines the tolerance class P4 (ABEC-7) with specific running accuracy requirements. |
S71904 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The optimized 25° contact angle and robust construction enable the bearing to support significant combined loads, providing a stable and rigid platform for precision applications.
- Superior High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction, contributing to a high limiting speed of 40,000 rpm. This makes it an excellent high-speed bearing.
- Precision Engineering: Adherence to the P4 tolerance class ensures extremely tight dimensional and running accuracy, which is critical for applications requiring minimal vibration and high positional precision.
- Sealed and Lubricated for Longevity: As a sealed bearing that comes pre-lubricated, it is protected from contamination and is ready for immediate use, offering a long service life with minimal maintenance.
S71904 ACD/P4A Bearing Typical Application Areas
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Medical and Dental Handpieces
- Aerospace Instrumentation
