71903 CD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71903 CD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.068 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
28 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
2498 lbf
Radial static load rating
1868 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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
Price available upon request.
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71903 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 71903 CD/P4AQBCC is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric bearing is supplied as a Quadruplex Back-to-Back (QBC) matched set, providing an extremely compact and highly rigid solution for supporting combined loads. Its moderate preload (Class C) ensures consistent performance, minimal deflection, and is ideal for high-speed operation in precision machinery.
71903 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 71903 | Basic Designation | Indicates a high-precision angular contact ball bearing series with a 17mm bore, 30mm OD, and 28mm width. |
| CD | Contact Angle & Design | Specifies a 15° contact angle, optimized for supporting combined radial and axial loads. |
| P4A | Tolerance Class | Denotes a super-precision tolerance class (equivalent to ABEC 7), ensuring minimal runout and vibration for ultra-precise applications. |
| QBCC | Matched Arrangement | Signifies a Quadruplex Back-to-Back (QBC) matched set of four bearings, pre-configured to provide maximum system rigidity and load distribution. |
71903 CD/P4AQBCC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an exceptionally stiff bearing system capable of withstanding heavy combined loads (radial and axial) and moment loads. This configuration is essential for applications where shaft deflection must be minimized.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, contributing to superior machine performance, reduced noise, and extended service life.
- Optimized High-Speed Capability: The phenolic resin cage is lightweight and robust, reducing centrifugal forces and allowing for a high limiting speed of 121,000 rpm. The 15° contact angle further enhances high-speed suitability.
- Pre-Lubricated for Immediate Use: The bearing comes lubricated and is suitable for a standard operating temperature range of -30°C to 110°C, ensuring immediate installation and reliable initial operation.
71903 CD/P4AQBCC Bearing Typical Application Areas
This precision bearing is engineered for the most demanding applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Aerospace Control Systems
- Medical and Dental Drill Handpieces
- Other machinery requiring ultra-high rigidity, precision, and speed.
