71904 CD/PA9ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71904 CD/PA9ADGA
Basic Information
System of measurement
Metric
Weight
0.07 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 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
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2194 lbf
Radial static load rating
1440 lbf
Limiting speed
100 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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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71904 CD/PA9ADGA Bearing Product Overview & Core Advantages
The 71904 CD/PA9ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. Engineered to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 15° contact angle and universal matchable (SU) design, allowing two bearings to be paired in a back-to-back or face-to-face arrangement for enhanced system rigidity. Manufactured to an ultra-precise PA9A tolerance class with an extra light preload (Class A), it delivers superior running accuracy and is optimized for high-speed operation up to 100,000 rpm.
71904 CD/PA9ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD, 18mm width). |
| CD | Indicates a universal matchable design with a 15° contact angle. Two CD-designated bearings can be universally paired. |
| PA9A | Specifies the high-precision tolerance class (PA9A) and the extra light preload (Class A). |
| DGA | Denotes the use of a phenolic resin cage, which is lightweight and ideal for high-speed applications, contributing to lower centrifugal forces and reduced friction. |
71904 CD/PA9ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and universal matching capability (SU) enable the bearing to handle significant combined radial and axial loads. When mounted in pairs, they create a highly rigid bearing system that minimizes deflection under load.
- Superior High-Speed Performance: The lightweight phenolic cage (DGA) reduces inertial forces, while the optimized internal geometry and 15° contact angle work in concert to support extremely high rotational speeds, with a limiting speed of 100,000 rpm.
- Ultra-Precision Operation: Manufactured to the stringent PA9A tolerance class with tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration for applications demanding the highest levels of precision.
- Optimized for Preload: The extra light preload (Class A) eliminates internal clearance, increases system stiffness, and improves rotational accuracy without generating excessive heat or friction.
71904 CD/PA9ADGA Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where speed, accuracy, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Spindles: PCB drilling and routing spindles.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace Actuators & Instrumentation: Gyroscopes and control surface mechanisms.
