71905 CD/PA9ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CD/PA9ADBB
Basic Information
System of measurement
Metric
Weight
0.084 kg
Tolerance class
PA9A
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/PA9ADBB Bearing Product Overview & Core Advantages
The 71905 CD/PA9ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional accuracy and rigidity. This matched set features a back-to-back (DB) arrangement and a light preload (Class B), making it ideal for handling combined radial and axial loads. Manufactured to an ultra-precise PA9A tolerance class, it delivers superior running accuracy, high stiffness, and reliable performance in demanding, high-speed environments. Its compact design and pre-lubrication ensure immediate operational readiness and long service life.
71905 CD/PA9ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation, indicating a high-precision angular contact bearing series with a 25 mm bore, 42 mm OD, and 18 mm width. |
| CD | Indicates a duplex bearing in a back-to-back (DB) arrangement. This configuration provides high moment rigidity and excellent stability. |
| PA9A | Specifies the tolerance class. PA9A represents an extremely high level of dimensional and running accuracy, surpassing standard ABEC 7/ISO P4 levels. |
| DBB | Confirms the duplex back-to-back mounting and the application of a light preload (Class B). |
71905 CD/PA9ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing system rigidity and resistance to moment loads, which is critical for maintaining precision under combined loads.
- Superior Precision: Manufactured to the PA9A tolerance class, this bearing ensures minimal runout and vibration, contributing to exceptional positional accuracy and smooth operation in high-speed applications.
- Optimized for High Speeds: The phenolic resin cage is lightweight and possesses excellent tribological properties, reducing centrifugal forces and friction, which supports the high limiting speed of 100,500 rpm.
- Pre-Configured Performance: The light preload (Class B) is applied at the factory, eliminating internal clearance and ensuring immediate, precise performance without the need for complex on-site adjustment.
- Robust Load Capacity: With a 15° contact angle and high-quality chrome steel construction, the bearing reliably handles significant radial and axial loads simultaneously.
71905 CD/PA9ADBB Bearing Typical Application Areas
This precision duplex angular contact ball bearing is engineered for high-performance machinery, including:
- Machine Tool Spindles (for grinding, milling, and turning)
- High-Frequency Spindles
- Precision Gearboxes
- Robotic Arms and Joints
- Medical and Dental Equipment
- Aerospace Actuation Systems
