71808 CD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71808 CD/P4DGB
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
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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
In Stock
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71808 CD/P4DGB Bearing Product Overview & Core Advantages
The 71808 CD/P4DGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universally matchable (SU) bearing supplied in a light preload (Class B) duplex set, it is engineered to handle combined loads with high rigidity. Its P4 tolerance class ensures superior running accuracy, making it ideal for high-reliability spindles and precision machinery where minimal runout and consistent performance are critical.
71808 CD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| 71808 | Basic bearing series and size designation (40mm bore, 52mm OD, 14mm width). |
| CD | Indicates a duplex pair in a universal matchable (SU) arrangement. This configuration provides high rigidity and is pre-loaded for immediate, precise operation. |
| P4 | Denotes a super-precision tolerance class (equivalent to ISO Class 4), ensuring extremely tight dimensional and running accuracy. |
| DGB | Signifies a duplex bearing set with a specific preload and accuracy grade. The "GB" combination typically refers to a Light preload (Class B) on a P4 precision bearing. |
71808 CD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex (CD) universal match creates a rigid bearing system capable of supporting significant combined radial and axial loads from both directions. The 15° contact angle is optimized for high-speed operation while maintaining good axial load capacity.
- Super-Precision Performance: Manufactured to P4 tolerance class, this bearing guarantees minimal radial and axial runout, which is essential for applications requiring extreme positional accuracy and smooth rotation.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and light preload contribute to a high limiting speed of 56,000 rpm.
- Optimized for Precision Matching: As a universally matchable (SU) bearing, any two bearings from this series can be paired without selective matching, simplifying inventory and assembly for duplex arrangements.
71808 CD/P4DGB 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 Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for CNC machinery.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace Instrumentation: Gyroscopes and other precision navigation systems.
