71808 CD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71808 CD/P4DBC
Basic Information
System of measurement
Metric
Weight
0.062 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
52 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
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1755 lbf
Radial static load rating
2205 lbf
Limiting speed
56 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
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In Stock
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71808 CD/P4DBC Bearing Product Overview & Core Advantages
The 71808 CD/P4DBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and moment load capacity, making it ideal for high-precision spindles and machinery. The bearing comes pre-lubricated and is manufactured to P4 tolerance class, ensuring minimal runout and smooth, quiet operation under high-speed conditions. Its compact design and moderate preload (Class C) deliver reliable performance for applications where precise shaft positioning is critical.
71808 CD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing series, indicating a metric, angular contact design with a 40mm bore. |
| C | 15° contact angle, optimized for combined loads. |
| D | Duplex bearing (two single bearings paired). |
| P4 | High precision tolerance class for superior running accuracy. |
| DB | Back-to-Back arrangement, providing high rigidity against moment loads. |
71808 CD/P4DBC Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Load Capacity: The duplex back-to-back (DB) configuration creates a wide, stable support system that significantly increases stiffness and resistance to tilting moments, ensuring precise shaft alignment under heavy combined loads.
- Optimized for Combined Loads: The 15° contact angle is engineered to efficiently handle simultaneous radial and axial loads, a common requirement in precision machinery.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 56,000 rpm. The standard lubrication ensures consistent performance across this range.
- Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing guarantees exceptional running accuracy and low vibration levels.
71808 CD/P4DBC Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where precision and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Applications requiring minimal backlash and high positional accuracy.
- High-Frequency Motors and Spindles: Where rapid acceleration and deceleration are standard.
- Medical and Laboratory Equipment: Centrifuges and other precision rotary devices.
- Robotics and Automation: Precision joints and rotary axes.
