71903 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71903 ACD/P4ADGB
Basic Information
System of measurement
Metric
Weight
0.034 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
14 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
1462 lbf
Radial static load rating
900 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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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71903 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 71903 ACD/P4ADGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing features a universal matchable (SU) design, allowing two bearings to be mounted in a versatile face-to-face or back-to-back arrangement to optimize performance. Its 25° contact angle is engineered to support significant combined loads, handling both radial and axial forces simultaneously. With a phenolic cage and pre-lubrication, it is optimized for high-speed operation and reliable performance in precision machinery.
71903 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° contact angle and universal matchable design (SU). |
| P4A | High precision tolerance class for running accuracy and dimensional stability. |
| DGB | Paired set of two bearings with light preload (Class B) applied. |
71903 ACD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design with a 25° contact angle provides superior stiffness and enables the bearing to effectively support combined radial and axial loads.
- High-Speed Performance: The lightweight phenolic resin cage ensures stability and reduced centrifugal forces, contributing to a high limiting speed of 121,000 rpm. The bearing is pre-lubricated for immediate high-speed operation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore, outside diameter, and width, ensuring predictable performance and ease of installation in high-precision applications.
- Matched Set Advantage: Supplied as a universal matchable (SU) pair with a defined light preload (Class B). This eliminates internal clearance, increases system rigidity, and simplifies mounting procedures.
71903 ACD/P4ADGB Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Medical and Dental Handpieces
- Aerospace Control Systems
