71904 CD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71904 CD/P4ADGA
Basic Information
System of measurement
Metric
Weight
0.07 kg
Tolerance class
P4A
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
80 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
Price:
$ 178.06
/ each
In Stock
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71904 CD/P4ADGA Bearing Product Overview & Core Advantages
The 71904 CD/P4ADGA is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing features a 15° contact angle and an Extra Light (A) preload, making it ideal for spindle systems requiring high-speed operation and minimal deflection. Its universal matchable (SU) design allows for flexible mounting in duplex pairs (DB or DF) to handle combined radial and axial loads simultaneously, ensuring superior performance in demanding precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series, indicating a high-precision angular contact design with 20mm bore, 37mm OD, and 18mm width. |
| CD | Contact angle of 15°. |
| P4A | High-precision tolerance class (exceeding ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DGA | Universal Matchable (SU) bearing supplied in a pre-loaded duplex set. |
71904 CD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Accuracy: The P4A tolerance class and extra light preload ensure minimal runout and high system stiffness, critical for maintaining precision under load.
- Optimized Load Capacity: The 15° contact angle is engineered to efficiently support combined loads, offering a balanced performance for both radial and axial forces.
- Superior High-Speed Performance: The phenolic resin cage and open design, combined with a limiting speed of 80,000 rpm, enable stable operation at very high rotational velocities with low friction and heat generation.
- Precision Materials: Constructed from chrome steel for both rings and balls, providing high durability, wear resistance, and consistent performance.
71904 CD/P4ADGA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high accuracy.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
