71903 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71903 CD/P4ADBC
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
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
934 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71903 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71903 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and the ability to withstand combined loads (radial and axial loads from both directions simultaneously). Manufactured to P4A tolerance class and featuring a phenolic cage, it is engineered for high-speed operation and reliable performance in precision machinery.
71903 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing designation indicating a metric, light series angular contact ball bearing. |
| C | Specifies a 15° contact angle, optimized for high-speed applications with significant axial loads. |
| D | Indicates the bearing is part of a duplex pair (two bearings supplied as a matched set). |
| P4A | Denotes a very high precision tolerance class, with enhanced running accuracy for spindle applications. |
| DB | Specifies the back-to-back (DB) mounting arrangement, which provides high moment rigidity. |
| (Moderate / Class C Preload) | The bearings are preloaded to a moderate level (Class C) to minimize axial and radial play, enhancing system rigidity. |
71903 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and complex combined loads. This design is critical for maintaining precision under heavy operating conditions.
- Optimized for High Speeds: The lightweight phenolic cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 121,000 rpm. The 15° contact angle further contributes to excellent high-speed performance.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, ensuring predictable and accurate performance in the most demanding spindle applications.
- Superior Material: Constructed from high-grade chrome steel for both rings and balls, providing high durability, wear resistance, and a long operational lifespan.
71903 CD/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery where rigidity and accuracy are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motors and spindles.
- Robotics: Articulated arms and precision joints requiring high moment stiffness.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical navigation systems.
