71903 FE/HCPA9AHDT
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71903 FE/HCPA9AHDT
Basic Information
System of measurement
Metric
Weight
0.028 kg
Tolerance class
PA9A
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
18 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1215 lbf
Radial static load rating
675 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71903 FE/HCPA9AHDT Bearing Product Overview & Core Advantages
The 71903 FE/HCPA9AHDT is a precision angular contact ball bearing designed for high-performance applications. Its defining characteristic is its duplex tandem (DT) arrangement, where two preloaded bearings are matched to significantly increase axial rigidity and load capacity in one direction. Manufactured to an ultra-precise PA9A tolerance class and featuring a ceramic ball and phenolic cage construction, this bearing is engineered for exceptional high-speed performance
71903 FE/HCPA9AHDT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation (17mm bore, 30mm OD). |
| FE | Identifies a specific internal design, typically related to contact angle and internal geometry optimization. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| PA9A | Specifies the ultra-high precision tolerance class, exceeding ABEC 9/ISO P4 standards. |
| H | Denotes a specific preload level (Heavy). |
| DT | Signifies the bearing is supplied as a Duplex Tandem matched set. |
71903 FE/HCPA9AHDT Bearing Structural Features & Performance Benefits
- Enhanced Rigidity and Load Capacity: The duplex tandem (DT) arrangement combines two bearings to act as a single, highly rigid unit. This configuration is optimized to handle very high axial loads in one direction, making it ideal for applications requiring minimal shaft deflection.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic balls reduces centrifugal forces, lowers operating temperatures, and allows for a very high limiting speed of 121,000 rpm. This makes it a premier choice for high-speed spindles.
- Ultra-Precision Operation: Manufactured to the PA9A tolerance class, this bearing ensures extremely tight running accuracy, minimal vibration, and consistent performance, which is critical for achieving high surface finishes and positional accuracy.
- Pre-Lubricated for Immediate Use: The bearing comes pre-lubricated, ensuring optimal performance from initial startup and simplifying the installation process.
71903 FE/HCPA9AHDT Bearing Typical Application Areas
The 71903 FE/HCPA9AHDT is specified for high-end machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Frequency CNC Spindle Units for machining centers and grinders
- Precision Grinding Spindles
- High-Speed Dental and Medical Handpieces
- Advanced Robotics and Automation Drives
- Aerospace Instrumentation and Gyroscopes
