71905 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.084 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2498 lbf
Radial static load rating
1800 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
No drawings available at the moment, will be launched soon
In Stock
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71905 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71905 CD/P4ADBB is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Light / Class B specifications, ensuring minimal axial and radial play for superior system stability. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other precision machinery where high rigidity and running accuracy are paramount.
71905 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 18mm width). |
| C | 15° contact angle, optimized for high-speed applications with significant axial loads. |
| D | Specifies a duplex back-to-back (DB) mounting arrangement. |
| P4A | Indicates a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DBB | Identifies the specific preload and matching grade within the set (Light / Class B). |
71905 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads, providing exceptional support for spindles and shafts.
- Precision Performance: Manufactured to P4A tolerance class with a 15° contact angle, this bearing delivers ultra-precise rotation, low noise, and minimal vibration, which is critical for high-quality surface finishes and positioning accuracy.
- Optimized for High Speeds: The lightweight phenolic cage and optimized internal geometry contribute to lower friction and enable a high limiting speed of 100,500 rpm, making it a true high-speed bearing.
- Superior Load Capacity: The angular contact design allows it to carry significant combined loads. With a dynamic load rating of 2498 lbf and a static load rating of 1800 lbf, it offers reliable performance under demanding conditions.
- Pre-lubricated & Ready-to-Install: The bearing is factory-lubricated, simplifying installation and ensuring immediate, reliable operation within its specified temperature range.
71905 CD/P4ADBB Bearing Typical Application Areas
This precision angular contact ball bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotic Drives: Joints and arm assemblies requiring high rigidity and accuracy.
- High-Frequency Motors and Spindles: Applications where rotational stability at very high RPM is critical.
- Medical and Dental Equipment: High-speed handpieces and diagnostic scanners.
- Aerospace Instrumentation: Gyroscopes, navigation systems, and other precision mechanisms.
