71901 CD/PA9ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71901 CD/PA9ADBA
Basic Information
System of measurement
Metric
Weight
0.02 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
12 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
981 lbf
Radial static load rating
562 lbf
Limiting speed
220 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
Extra light / Class A
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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Product Overview and Core Advantages
The 71901 CD/PA9ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex back-to-back (DB) arrangement bearing set delivers superior high rigidity and can accommodate combined radial and axial loads. Manufactured to an ultra-precise PA9A tolerance class, it features an extra light preload (Class A) for optimal running accuracy in high-speed operations, making it an ideal solution for high-reliability machinery.
71901 CD/PA9ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Basic bearing designation indicating size series (71) and bore diameter (01 = 12mm). |
| C | 15° contact angle, optimized for high axial load capacity. |
| D | Duplex Back-to-Back (DB) matched arrangement. |
| PA9A | Ultra-high precision tolerance class (PA9A) and extra light preload (Class A). |
| DBA | Specific manufacturer suffix for the DB set configuration and preload. |
Structural Features and Performance Benefits
- High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads, ensuring exceptional shaft positioning accuracy and operational stability.
- Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 981 lbf, this bearing is engineered to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, while the precision-ground chrome steel components and extra light preload contribute to a high limiting speed of 220,000 rpm.
- Precision Engineering: Adherence to the PA9A tolerance class and tight dimensional tolerances on the bore diameter, outside diameter, and width guarantees consistent, high-precision performance in the most demanding applications.
71901 CD/PA9ADBA Bearing Typical Application Areas
This high-precision duplex bearing set is ideally suited for applications where maximum rigidity and running accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles for high-speed milling and grinding
- Precision Gearboxes and transmission systems
- High-Frequency Spindles in PCB drilling and routing machines
- Medical and Dental Equipment requiring quiet, precise rotation
- Robotic Arm Joints and precision automation systems
