71809 CD/P4DT
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71809 CD/P4DT
Basic Information
System of measurement
Metric
Weight
0.078 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
58 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1784 lbf
Radial static load rating
2385 lbf
Limiting speed
46 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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Product Overview and Core Advantages
The 71809 CD/P4DT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This duplex tandem (DT) arrangement bearing set is preloaded, delivering superior high rigidity and precise axial positioning. Engineered to handle combined loads, it efficiently supports significant axial loads in one direction while accommodating radial loads. Manufactured to P4 tolerance class, it ensures minimal runout and vibration, making it ideal for high-speed spindles and other precision machinery where uncompromising performance is critical.
71809 CD/P4DT Bearing Model Code Explained, Specifications & Naming Convention
The model number 71809 CD/P4DT is decoded as follows:
- 71809: Basic bearing series, indicating a light series angular contact ball bearing with a 45 mm bore.
- C: Denotes a 15° contact angle, optimized for high axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- P4: Specifies the tolerance class, indicating very high precision with tight dimensional and running accuracy tolerances.
- DT: Defines the Duplex Tandem arrangement. In this configuration, two bearings are mounted together to increase axial load capacity in a single direction.
Structural Features and Performance Benefits
- High Rigidity and Axial Stiffness: The duplex tandem (DT) arrangement and factory-applied preload create an exceptionally rigid bearing system, minimizing deflection under load for superior positional accuracy.
- Superior Load Capacity: The 15° contact angle and tandem configuration are engineered to handle high axial loads in one direction, in addition to radial loads, making it suitable for combined loading conditions.
- High-Speed Capability: The lightweight phenolic cage and P4 precision grading contribute to smooth operation, reduced centrifugal forces, and a high limiting speed of 46,000 rpm.
- Precision Performance: The P4 tolerance class ensures tight control over bore, outside diameter, and width tolerances, resulting in low noise, low vibration, and enhanced operational accuracy.
- Optimized Material Selection: Components made from chrome steel provide high hardness and durability, while the phenolic cage offers excellent strength-to-weight ratio and operates smoothly at high speeds.
71809 CD/P4DT Bearing Typical Application Areas
This high-precision duplex tandem bearing set is ideally suited for applications requiring high rigidity and precise axial guidance, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors operating at very high rotational speeds.
- Robotic Drives: Critical joints and actuators requiring high stiffness and accuracy.
