71903 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71903 CD/P4A
Basic Information
System of measurement
Metric
Weight
0.017 kg
Tolerance class
P4 (ABEC-7)
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
-0.005mm to 0
Width
7 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° to 110 °C
Radial dynamic load rating
936 lbf
Radial static load rating
468 lbf
Limiting speed
80 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
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:
$ 89.03
/ each
In Stock
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71903 CD/P4A Bearing Product Overview & Core Advantages
The 71903 CD/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and superior running accuracy. As a P4 (ABEC-7) tolerance class bearing, it is engineered for exceptional dimensional stability and minimal rotational runout. Its key advantage lies in its ability to accommodate combined loads—simultaneously handling significant radial loads and axial loads in one direction. The phenolic cage and optimized 15° contact angle contribute to its high-speed capability and smooth operation, making it an ideal choice for compact, high-performance assemblies.
71903 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation (17mm bore, 30mm OD, 7mm width). |
| CD | Indicates a specific contact angle (15°) and internal design optimized for high rigidity and precise operation. |
| P4A | Denotes a high-precision tolerance class equivalent to ABEC-7. The "A" suffix may specify additional dimensional accuracy requirements for the outer ring. |
71903 CD/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class with a 15° contact angle, this bearing provides excellent dimensional accuracy and high rigidity, ensuring stable shaft positioning and reduced vibration.
- Optimized for High Speeds: The lightweight phenolic resin cage minimizes centrifugal forces and inertial drag, enabling a high limiting speed of 80,000 rpm. This makes it a premier high-speed bearing.
- Superior Load Capacity: The single-row design with a optimized raceway geometry is engineered to handle combined radial and axial loads efficiently, offering a dynamic load rating of 936 lbf.
- Pre-Lubricated for Immediate Use: The bearing comes pre-lubricated, facilitating easy installation and immediate operation within a wide temperature range of -30°C to 110°C.
71903 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-speed and high-accuracy applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Medical and Dental Handpieces
- Robotic Drives and Actuators
