71940 CD/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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71940 CD/HCP4ATBTA Bearing Product Overview & Core Advantages
The 71940 CD/HCP4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This bearing is supplied as a Triplex Back-to-Back (TBT) matched set, comprising three individual bearings pre-configured to deliver superior system stability and load-handling capabilities. Its core advantages include the ability to accommodate combined loads (radial and axial) simultaneously, outstanding high-speed performance enabled by its phenolic cage and ceramic balls, and exceptional operational reliability due to its P4A super-precision tolerance class and pre-lubrication.
71940 CD/HCP4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation. |
| CD | Indicates a 15° contact angle, optimized for high-speed operation. |
| HC | Signifies the use of Hybrid Ceramic balls (ceramic balls with steel rings). |
| P4A | Denotes a super-precision tolerance class exceeding ABEC 7/ISO P4, ensuring minimal runout and vibration. |
| TBT | Specifies the Triplex Back-to-Back matched arrangement of three bearings. |
| A | Identifies the Extra Light preload class, ideal for minimizing friction and heat generation at high speeds. |
71940 CD/HCP4ATBTA Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The Triplex Back-to-Back (TBT) arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This configuration provides superior axial and radial stiffness, which is critical for maintaining precision under load.
Superior High-Speed Performance: The combination of a lightweight phenolic cage and hybrid ceramic balls (silicon nitride) significantly reduces centrifugal forces and operating temperatures. This allows the bearing to achieve a high limiting speed of 6,300 rpm with minimal wear and energy loss.
Extended Service Life and Reliability: Ceramic balls are harder, lighter, and more resistant to wear and corrosion than steel balls. They also provide electrical insulation. The bearing is pre-lubricated for immediate operation and is manufactured to P4A precision tolerances, ensuring smooth, quiet, and vibration-free performance essential for high-precision machinery.
71940 CD/HCP4ATBTA Bearing Typical Application Areas
This high-performance bearing set is engineered for the most demanding applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and drilling centers.
- Precision Robotics: In high-accuracy robotic arms and joints.
- Aerospace & Defense Systems: In gyroscopes, radar platforms, and navigation instruments.
- High-Speed Motors and Turbomachinery: Where minimal vibration and high rotational accuracy are required.
