71903/VA9D1
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71903/VA9D1
Basic Information
System of measurement
Metric
Weight
0.017 kg
Tolerance class
P4
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
2
Universal matching bearing
Universal Matchable (SU)
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
In Stock
Price available upon request.
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71903/VA9D1 Bearing Product Overview & Core Advantages
The 71903/VA9D1 is a precision angular contact ball bearing engineered for applications demanding high rotational accuracy and rigidity. As a single bearing designed for universal matching (SU), it can be paired with another identical bearing to form a precisely preloaded set, enabling optimal performance under combined loads. Its compact design with a 7 mm width provides a space-saving solution without compromising on load capacity or high-speed performance, making it ideal for high-reliability applications.
71903/VA9D1 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing designation indicating the bearing size and series (17 mm bore, 30 mm OD). |
| VA9D1 | Manufacturer-specific code indicating a universally matchable (SU) bearing with a specific preload class and internal design. |
71903/VA9D1 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and robust construction enable the bearing to efficiently handle significant combined radial and axial loads in one direction, providing stable and rigid support for shafts.
- Precision & High-Speed Performance: Manufactured to P4 tolerance class for exceptional running accuracy. The phenolic resin cage and optimized internal geometry contribute to low friction and a high limiting speed of 121,000 rpm, suitable for demanding high-speed applications.
- Universal Matching Capability (SU): This bearing is supplied as a single bearing but is designed to be universally matchable. Two bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to create a preloaded set that enhances system stiffness and rotational accuracy.
- Pre-Lubricated & Ready-to-Use: The bearing comes lubricated from the factory, simplifying installation and ensuring immediate operational readiness.
71903/VA9D1 Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles
- High-Speed Grinding & Milling Heads
- Precision Robotics & Automation Equipment
- High-Frequency Spindles
- Medical & Dental Handpieces
