71806 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71806 CD/P4DBB
Basic Information
System of measurement
Metric
Weight
0.052 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 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
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1609 lbf
Radial static load rating
1688 lbf
Limiting speed
100.5 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
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In Stock
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71806 CD/P4DBB Bearing Product Overview & Core Advantages
The 71806 CD/P4DBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, providing superior axial and radial stiffness while minimizing deflection under complex loads. Its P4 tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other demanding precision machinery where high rigidity and stability are critical.
71806 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71806 | Basic bearing designation indicating a metric, angular contact ball bearing with a 30mm bore, 42mm OD, and 14mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and combined loads. |
| D | Indicates the bearing is part of a duplex pair. |
| P4 | Specifies the high-precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| DB | Denotes the Back-to-Back (DB) matched arrangement, providing high moment rigidity and stable operation under complex loading conditions. |
71806 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement with a Light preload (Class B) creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise positioning and smooth operation.
- Superior Load Capacity: The 15° contact angle and optimized internal geometry enable the bearing to handle significant combined radial and axial loads simultaneously, a key requirement in precision applications.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces and ensures stable guidance of the balls at high rotational speeds, contributing to the high limiting speed of 100,500 rpm.
- Precision Engineering: Manufactured to P4 tolerance class with chrome steel rings and balls, this bearing guarantees minimal runout and vibration, which is essential for achieving high surface finishes and machining accuracy.
71806 CD/P4DBB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables: Indexing and positioning systems.
- High-Frequency Motors & Spindles: Applications requiring minimal vibration and high running accuracy.
- Medical & Laboratory Equipment: Centrifuges and other precision instruments.
