71903 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71903 ACD/P4ADGA
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
103 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:
$ 144.73
/ each
In Stock
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71903 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71903 ACD/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universal matchable (SU) bearing supplied in a pre-lubricated set of two, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4A tolerance class and extra light preload (Class A) ensure smooth, quiet operation with minimal vibration, making it ideal for high-precision, high-reliability spindles and machinery.
71903 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | Indicates super-precision tolerance class (exceeding ABEC 7), ensuring extremely tight dimensional and running accuracy for high-speed applications. |
| DGA | Universal Matchable (SU) designation. Two bearings are supplied as a matched set that can be arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations without additional selection, simplifying installation and ensuring optimal preload. |
71903 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and precision-ground raceways provide high rigidity and enable the bearing to support significant combined radial and axial loads.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the P4A precision and optimized internal geometry contribute to a high limiting speed of 103,000 rpm.
- Precision & Stability: Manufactured to super-precision P4A tolerances with an extra light preload, this bearing minimizes runout and thermal growth, ensuring exceptional positional accuracy and smooth operation.
- Ready-to-Install Matched Set: Supplied as a universal matchable (SU) pair, these bearings are pre-selected to deliver consistent, predictable performance in any mounting arrangement, reducing assembly time and complexity.
71903 ACD/P4ADGA Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications requiring supreme accuracy and speed, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Dental and Medical Handpiece Drives
- Aerospace Instrumentation and other critical precision machinery.
