S71908 ACD/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71908 ACD/P4A Bearing Product Overview & Core Advantages
The S71908 ACD/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and high-speed operation. Its defining characteristic is the 25° contact angle, which enables it to support significant combined loads—simultaneously handling radial loads and axial loads in one direction. Manufactured to the exacting P4 (ABEC-7) tolerance class, it guarantees exceptional running accuracy. The bearing is preloaded and comes pre-lubricated, making it a compact, ready-to-install solution for high-reliability machinery where space and performance are critical.
Model Code In-Depth Analysis
- S7: Denotes a series of high-precision angular contact ball bearings.
- 1908: Standard dimension series code; 19 for the width series and 08 for the bore diameter code (40 mm).
- ACD: Signifies a 25° contact angle and that the bearing is supplied as a matched set (Duplex arrangement) for preload.
- P4A: Indicates the tolerance class P4 (ABEC-7) with specific dimensional and running accuracy requirements. The "A" suffix may refer to a specific internal clearance or tolerance grouping.
S71908 ACD/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces and ensures stable operation at the high limiting speed of 20,000 rpm. Combined with the optimized internal geometry and pre-lubrication, it delivers superior high-speed performance.
High Rigidity and Load Capacity: The 25° contact angle and preload provide high axial and radial rigidity, effectively resisting operational deflection. This design results in a substantial dynamic load rating of 2632 lbf and a static load rating of 1800 lbf.
Precision and Longevity: Manufactured from chrome steel for rings and balls, and held to P4 precision tolerances, this bearing ensures minimal vibration and extended service life in demanding applications.
S71908 ACD/P4A Bearing Typical Application Areas
The S71908 ACD/P4A is ideally suited for high-performance machinery requiring precision and speed, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Medical and Dental Equipment
- Robotic Drives and Servo Motors
