71912 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71912 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71912 CD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. This triplex back-to-back (TBT) matched set delivers exceptional system rigidity and rotational accuracy. Operating under a P4A tolerance class and an extra light preload (Class A), it is engineered to handle high-speed operations up to 31,000 rpm while providing superior running accuracy. Its primary advantage lies in its ability to manage complex combined loads, making it an ideal choice for high-performance spindles requiring maximum stability and precision.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing series and size designation |
| CD | Contact angle of 15° |
| P4A | High-precision tolerance class (exceeds ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement |
| A | Extra light preload (Class A) |
71912 CD/P4ATBTA Bearing Structural Features & Performance Benefits
Triplex Back-to-Back Configuration: The arrangement of three bearings in a back-to-back configuration creates an exceptionally rigid bearing system, capable of withstanding significant moment loads and providing superior shaft positioning accuracy.
High-Speed Capability: The combination of a phenolic resin cage, 15° contact angle, and optimized internal geometry enables stable operation at limiting speeds of 31,000 rpm, making it suitable for high-speed machining applications.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for superior machining finish and accuracy.
Enhanced Load Capacity: With a dynamic load rating of 9518 lbf and static load rating of 10462 lbf, this bearing set provides reliable performance under substantial combined radial and axial loads.
Optimized Material Selection: Constructed from chrome steel rings and balls with a phenolic cage, offering excellent strength-to-weight ratio and dimensional stability across the operating temperature range of -30°C to 110°C.
71912 CD/P4ATBTA Bearing Typical Application Areas
This precision angular contact bearing set is specifically designed for high-performance applications requiring exceptional rigidity and speed capabilities:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Spindles: PCB drilling, engraving, and precision machining equipment
- High-Speed Automation: Robotics, CNC machining centers, and automated manufacturing systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: High-speed dental handpieces and surgical tools
