71809 CD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71809 CD/P4DBC
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 Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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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71809 CD/P4DBC Bearing Product Overview & Core Advantages
The 71809 CD/P4DBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric system bearing features a back-to-back (DB) matched arrangement and a Moderate (Class C) preload, enabling it to handle combined radial and axial loads simultaneously. Manufactured to P4 tolerance class, it delivers high running accuracy and is pre-lubricated for immediate use, making it ideal for high-speed, high-precision machinery where reliability is critical.
71809 CD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71809 CD/P4DBC is decoded as follows:
- 71809: Basic bearing series, indicating a light-weight, high-precision angular contact design with a 45mm bore.
- C: Represents a 15° contact angle, optimized for handling combined loads.
- D: Indicates the bearing is part of a duplex pair.
- P4: Denotes the tolerance class, signifying very high precision in dimensions and running accuracy.
- DB: Specifies the Duplex Back-to-Back mounting arrangement, which provides high rigidity and moment load capacity.
- C: Indicates the Moderate preload (Class C), which enhances stiffness and minimizes axial and radial play.
71809 CD/P4DBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back (DB) duplex arrangement creates a wide effective spread between load centers, significantly increasing the bearing's rigidity and its ability to withstand moment loads.
- Superior Load Capacity: With a 15° contact angle and duplex design, this bearing efficiently supports substantial combined radial and axial loads in both directions.
- Precision & High-Speed Performance: Manufactured to P4 tolerance class and featuring a lightweight phenolic resin cage, the bearing ensures smooth operation and is capable of achieving a limiting speed of 46,000 rpm.
- Optimized for Precision Applications: The moderate preload eliminates internal clearance, ensuring precise shaft positioning, reduced vibration, and improved system responsiveness.
- Durable Construction: Components made from chrome steel for rings and balls provide high wear resistance and long service life under demanding conditions.
71809 CD/P4DBC Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Medical and Dental Equipment Spindles
- Aerospace Control Systems
