71909 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.26 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
24 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
4770 lbf
Radial static load rating
4275 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 201.64
/ each
In Stock
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71909 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71909 CD/P4ADBB is a precision angular contact ball bearing configured as a duplex back-to-back (DB) matched set. This configuration delivers exceptional system rigidity and is engineered to handle combined radial and axial loads simultaneously. Manufactured to the exacting P4A tolerance class, it is designed for applications demanding high running accuracy, precise shaft positioning, and reliable performance in high-speed operations up to 41,000 rpm. The pre-lubricated and light preload (Class B) ensures optimal performance from initial operation.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing designation indicating a high-precision angular contact bearing series with a 45 mm bore, 68 mm OD, and 24 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) pair. |
| P4A | Specifies the high-precision tolerance class, exceeding ABEC 7 standards, for superior running accuracy and minimal runout. |
| DB | Specifies the Back-to-Back arrangement of the matched pair. This configuration provides high moment rigidity and excellent stability. |
| B | Indicates a Light Preload (Class B), which minimizes axial and radial play for precise shaft positioning without excessive friction or heat generation. |
71909 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and tilting moments. This design enables the bearing set to handle significant combined radial and axial loads from both directions.
- Precision & High-Speed Performance: The P4A tolerance class ensures minimal vibration and high running accuracy. The 15° contact angle and phenolic resin cage contribute to low friction, low heat generation, and stable operation at the high limiting speed of 41,000 rpm.
- Optimized Internal Geometry: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers high durability and fatigue life. The 23 balls with a diameter of 6.35 mm provide an optimal balance between load capacity and speed capability.
- Ready-to-Install Performance: The set is supplied pre-lubricated and with a light preload, ensuring immediate, optimal performance upon installation and simplifying the mounting process.
71909 CD/P4ADBB Bearing Typical Application Areas
This precision matched bearing set is ideally suited for high-performance applications requiring high rigidity, speed, and accuracy, such as:
- Machine Tool Spindles (e.g., for milling, grinding, and high-speed machining centers)
- Precision Gearboxes and High-Frequency Motor Spindles
- Industrial Pumps and Compressors
- Robotic Arms and Precision Rotary Tables
- Aerospace Actuation Systems and Medical Equipment
