71904 ACDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71904 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.035 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
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1287 lbf
Radial static load rating
686 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71904 ACDGB/P4A Bearing Product Overview & Core Advantages
The 71904 ACDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with a Universal Matchable (SU) designation, it can be mounted alongside other SU bearings in various preloaded arrangements to achieve optimal system performance. Its key advantages include high-speed capability, superior running accuracy from its P4A tolerance class, and the ability to accommodate combined loads efficiently due to its 25° contact angle. This makes it an ideal, compact solution for high-reliability, high-precision machinery.
71904 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD, 9mm width). |
| AC | Angular Contact design. |
| D | High contact angle of 25°. |
| GB | Light preload / Class B. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
71904 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design with a 25° contact angle provides excellent resistance to combined radial and axial loads. The phenolic resin cage ensures stable operation under high stresses.
- Super-Precision Performance: Manufactured to a P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, minimizing vibration and supporting ultra-precise positioning.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 75,000 rpm, making it suitable for demanding high-speed applications.
- Universal Matching: As a Universal Matchable (SU) bearing, it can be universally paired with other SU bearings in sets (e.g., DB, DF, DT arrangements) without selective matching, simplifying installation and ensuring consistent preload.
71904 ACDGB/P4A Bearing Typical Application Areas
This precision bearing is engineered for the most demanding sectors, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Robotic Drives: In joints and arm assemblies where high positional repeatability is critical.
- High-Frequency Spindles: Used in PCB drilling and routing equipment.
- Medical and Dental Equipment: In high-speed handpieces and imaging scanners.
- Aerospace Gyroscopes and Instrumentation: Where reliability and precision under dynamic loads are paramount.
