S71921 ACD/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71921 ACD/P4A Bearing Product Overview & Core Advantages
The S71921 ACD/P4A is a single-row angular contact ball bearing designed for applications requiring high precision and exceptional performance. Engineered to P4 (ABEC-7) tolerance class, it delivers superior running accuracy. Its primary advantage lies in its ability to accommodate combined loads—significant radial loads and substantial axial loads in one direction—making it ideal for high-rigidity, high-speed applications. The bearing comes preloaded and lubricated for immediate use, ensuring reliable operation and simplified installation.
S71921 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71921 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 105mm bore and 145mm outside diameter. |
| ACD | Contact angle of 25° and a specific internal design optimized for high axial load capacity and high-speed operation. |
| P4A | Denotes a P4 (ABEC-7) tolerance class for exceptional dimensional and running accuracy. The "A" suffix often indicates a specific preload level or internal clearance for optimal performance. |
S71921 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4 tolerance class with a 25° contact angle, this bearing provides high running accuracy and system rigidity, minimizing deflection under load.
- Superior Load Capacity: The optimized internal geometry and chrome steel construction enable high radial dynamic (12,870 lbf) and static (14,738 lbf) load ratings, effectively handling combined loads.
- High-Speed Capability: The lightweight phenolic resin cage and precision-ground components contribute to a high limiting speed of 7,500 rpm, reducing centrifugal forces and heat generation.
- Sealed & Lubricated for Life: As a sealed and pre-lubricated unit, it is protected from contamination and is ready for use, offering long-term, maintenance-free operation within its specified temperature range.
S71921 ACD/P4A Bearing Typical Application Areas
The S71921 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 & Compressors
- Medical & Laboratory Equipment
