71909 CD/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 CD/HCP4ATBTA
Basic Information
System of measurement
Metric
Weight
0.36 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6322 lbf
Radial static load rating
6412 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71909 CD/HCP4ATBTA Bearing Product Overview & Core Advantages
The 71909 CD/HCP4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This triplex matched set in a back-to-back arrangement (TBT) delivers superior system rigidity and stability. Featuring a P4A tolerance class and ceramic balls, it is engineered for high-speed operation and extended service life. Its configuration is optimized to handle combined radial and axial loads simultaneously, making it ideal for ultra-precise, high-reliability machinery.
71909 CD/HCP4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD). |
| CD | Indicates a 15° contact angle and specific internal design for high precision. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced friction and higher speed capability. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| TBT | Specifies a Triplex Back-to-Back matched set of three bearings. |
| A | Indicates an Extra Light preload for minimal friction and optimal high-speed performance. |
71909 CD/HCP4ATBTA Bearing Structural Features & Performance Benefits
- Extreme Rigidity & Stability: The triplex back-to-back (TBT) arrangement of three bearings creates an exceptionally stiff bearing system, effectively resisting complex moment loads and maintaining shaft alignment under severe operating conditions.
- Superior High-Speed Performance: The combination of hybrid ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers rotating mass and friction, enabling a high limiting speed of 41,000 rpm.
- High Precision & Accuracy: Manufactured to a P4A tolerance class with a 15° contact angle, this bearing ensures minimal runout and precise rotational accuracy, which is critical for applications like machine tool spindles.
- Optimized Load Capacity: The angular contact design is engineered to handle significant combined loads (radial and axial) simultaneously. The matched set configuration ensures even load distribution across all three bearings.
- Pre-Lubrication: The bearing comes lubricated from the factory, ready for immediate installation and initial operation within its specified temperature range.
71909 CD/HCP4ATBTA Bearing Typical Application Areas
This high-performance bearing set is specifically designed for the most demanding applications across various industries:
- High-Frequency Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling spindles requiring high rigidity, speed, and precision.
- Precision Grinding Machinery: Internal and external grinding machines where minimal vibration and runout are paramount.
- High-Speed Motors and Drives: Motors for robotics, aerospace, and semiconductor manufacturing equipment.
- Advanced Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
