S71919 ACD/P4AQBTC
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S71919 ACD/P4AQBTC Bearing Product Overview & Core Advantages
The S71919 ACD/P4AQBTC is a super-precision angular contact ball bearing designed for the most demanding applications. Its Quadruplex Tandem Back-to-Back (QBT) matched arrangement provides exceptional axial rigidity and the ability to handle complex combined loads. Manufactured to the stringent P4A tolerance class and preloaded, this bearing is engineered for high-speed operation, superior rotational accuracy, and long-term reliability in precision machinery.
S71919 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S71919 | Basic Bearing Series & Size | Indicates a 95mm bore, 130mm OD, 72mm width bearing from a high-precision series. |
| ACD | 25° Contact Angle | Optimized for carrying significant axial loads in addition to radial loads. |
| P4A | Tolerance Class | Denotes a super-precision bearing with extremely tight dimensional and running accuracy tolerances. |
| QBT | Matched Arrangement | Signifies a Quadruplex Tandem Back-to-Back set of 4 bearings, providing maximum axial stiffness. |
| C | Preload Class | Indicates a moderate preload for enhanced rigidity and precise shaft positioning. |
S71919 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) configuration is the key to this bearing's performance. This arrangement creates an extremely rigid system capable of withstanding heavy combined loads (radial and axial) from multiple directions, making it ideal for applications where shaft deflection must be minimized.
High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the high limiting speed of 21,000 rpm. The optimized internal geometry and 25° contact angle further support smooth, high-velocity rotation.
Precision and Longevity: Manufactured as a P4A tolerance class bearing from chrome steel, it guarantees minimal runout and vibration. The bearings are sealed and pre-greased, protecting the precision-ground surfaces from contamination and providing reliable lubrication throughout the specified temperature range.
S71919 ACD/P4AQBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is engineered for critical applications where accuracy and stability are paramount. Key industries and machinery include:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and turning)
- Precision Grinding Spindles
- Industrial High-Frequency Motors
- Aerospace and Defense Positioning Systems
- Medical and Laboratory Equipment (e.g., high-speed centrifuges)
