S71920 ACD/P4ATBTC
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The S71920 ACD/P4ATBTC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex matched set features a back-to-back (TBT) arrangement, providing superior stability under combined radial and axial loads. Manufactured to P4A tolerance class, it delivers ultra-precise rotational accuracy, making it ideal for high-speed spindles and other precision machinery where uncompromising performance is critical.
S71920 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Precision series, 100 mm bore, 140 mm OD, 60 mm width |
| ACD | 25° contact angle design, optimized for axial load capacity |
| P4A | High-precision tolerance class (superior to ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement |
| C | Moderate preload class for optimal rigidity |
Structural Features and Performance Benefits
Enhanced Rigidity and Stability: The triplex back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise positioning and minimal runout.
Superior Load Capacity: With a 25° contact angle and triple-row configuration, this bearing set delivers exceptional performance under combined radial and axial loads in both directions, making it suitable for complex loading conditions.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio and smooth operation at high speeds, supporting the limiting speed of 16,250 rpm while maintaining dimensional stability.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal vibration and consistent performance in precision applications.
S71920 ACD/P4ATBTC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity
- Precision Robotics: Articulated arms and positioning systems demanding accurate motion control
- Aerospace Components: Guidance systems, actuators, and other critical rotating assemblies
- Medical Equipment: High-speed dental handpieces, surgical robots, and imaging system components
- Test and Measurement Instruments: Precision rotary tables and calibration equipment
