71903 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71903 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.017 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
30 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
893 lbf
Radial static load rating
450 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71903 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71903 ACDGC/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with a 25° contact angle and Moderate (Class C) preload, it is engineered to handle significant combined loads—simultaneous radial and axial loads—with high reliability. Its compact design, featuring a 17 mm bore and 7 mm width, makes it ideal for high-speed spindles and other precision machinery where space is constrained and performance is critical.
71903 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| DGC | Designates a Universal Matchable (SU) bearing, which can be mounted in sets (in this case, a set of 3) to achieve specific preload and stiffness characteristics. |
| P4A | Indicates a super-precision tolerance class, ensuring extremely tight dimensional and running accuracy for high-performance applications. |
71903 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and Moderate preload provide superior stiffness, enabling the bearing to effectively support combined radial and axial loads with minimal deflection.
- High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to the high limiting speed of 121,000 rpm. The bearing is pre-lubricated for immediate operation and reduced friction.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing guarantees smooth, quiet, and accurate rotation essential for precision equipment.
- Universal Matching Design: As a Universal Matchable (SU) bearing, it can be supplied and installed in precisely matched sets (of 3) to create a pre-loaded bearing system without the need for complex adjustments, simplifying assembly and enhancing system performance.
71903 ACDGC/P4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Drives and Servo Motors
