71909 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71909 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71909 CD/P4ATBTA is a metric precision angular contact ball bearing supplied as a triplex back-to-back (TBT) matched set. Engineered for applications demanding extreme rotational accuracy and high system rigidity, this configuration excels at supporting combined loads (radial and axial) simultaneously. Its P4A tolerance class and extra light preload (Class A) ensure smooth, low-vibration operation, making it ideal for high-speed, high-precision spindles and machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Bearing series and size designation (45mm bore, 68mm OD, 36mm width) |
| CD | Contact angle of 15° |
| P4A | High precision tolerance class, with enhanced running accuracy requirements |
| TBT | Triplex Back-to-Back arrangement of three matched bearings |
| A | Extra light preload for minimal friction and optimal high-speed performance |
71909 CD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The triplex back-to-back arrangement creates an exceptionally stiff bearing system, capable of handling significant moment loads and combined radial and axial loads from both directions. This configuration provides superior shaft positioning accuracy.
Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and stable operation at high rotational speeds, with a limiting speed of 41,000 rpm. The 15° contact angle offers an optimal balance between axial and radial load capacity for high-speed applications.
Optimized Material & Design: Constructed from chrome steel for both rings and balls, the bearing provides excellent durability and fatigue resistance. The phenolic cage contributes to lower weight and smoother operation at high speeds compared to metallic cages.
71909 CD/P4ATBTA Bearing Typical Application Areas
The 71909 CD/P4ATBTA is specifically designed for high-performance applications requiring maximum precision and rigidity, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motor Spindles
- Industrial Robotics (Precision rotary joints and arms)
- Aerospace Test Equipment and other precision rotary systems
