S71909 CD/P4ATBTC
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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S71909 CD/P4ATBTC Bearing Product Overview & Core Advantages
The S71909 CD/P4ATBTC is a metric system, P4A super-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This bearing features a triplex back-to-back (TBT) matched arrangement, providing superior stability and the ability to withstand combined loads (radial and axial) from multiple directions. Its sealed design with moderate preload (Class C) ensures consistent performance, high running accuracy, and is optimized for high-speed operation, making it an ideal choice for high-precision spindles and machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71909 | Series designation for a 45mm bore, 68mm OD angular contact ball bearing. |
| CD | Indicates a triplex back-to-back (TBT) matched set of three bearings. |
| P4A | Denotes a super-precision tolerance class with enhanced running accuracy and dimensional control. |
| TB | Specifies the cage material: Phenolic (fiberglass reinforced), beneficial for high-speed operation. |
| T | Indicates the bearing is sealed for contamination protection. |
| C | Specifies a moderate preload (Class C) for optimal rigidity and minimal deflection. |
S71909 CD/P4ATBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement of three bearings creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior Load Capacity: The 15° contact angle and matched set configuration enable the bearing to handle significant combined radial and axial loads simultaneously.
- High-Speed Performance: The lightweight phenolic cage and grease lubrication are engineered for a high limiting speed of 46,000 rpm, reducing centrifugal forces and operational temperatures.
- Precision and Longevity: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances for superior running accuracy. The sealed design and pre-applied grease offer protection and extended service life in various operating conditions within a temperature range of -30°C to 110°C.
S71909 CD/P4ATBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing is specifically designed for advanced applications, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Grinding Equipment
- Industrial Pumps and Compressors requiring high-speed and accuracy
- Advanced Robotics and Automation Systems
