71903 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71903 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.015 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
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
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71903 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71903 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and an Extra Light (Class A) preload, making it ideal for systems where minimal deflection under load is critical. Its ceramic balls and P4A tolerance class ensure superior high-speed performance, reduced friction, and extended service life, providing a reliable solution for combination loads.
71903 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71903 ACDGA/HCP4A is decoded as follows:
- 71903: Basic series designation, indicating a metric, single row angular contact ball bearing with specific dimensions (17mm bore, 30mm OD, 7mm width).
- AC: Angular Contact design.
- D: High-Precision Designation.
- GA: Universal Matchable (SU) bearing, designed to be mounted in sets (in this case, a set of 3) to achieve specific preload and rigidity characteristics.
- HCP4A: P4A Tolerance Class, denoting very high dimensional and running accuracy exceeding standard ABEC 7/ISO P4 levels.
71903 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Accuracy: The combination of a 25° contact angle and a factory-set Extra Light preload (Class A) provides high system stiffness and precise shaft positioning, minimizing runout and vibration.
- Superior High-Speed Performance: The use of ceramic (Si3N4) balls significantly reduces centrifugal forces, lowers operating temperatures, and allows for a limiting speed of 121,000 rpm. The phenolic resin cage is lightweight and robust, further enhancing high-speed capability.
- Extended Service Life: Ceramic balls are electrically insulating and highly resistant to wear and degradation, leading to a dramatically longer operational life compared to all-steel bearings, especially in challenging environments.
- Precision Matched Sets: As a Universal Matchable (SU) bearing, it is supplied from the factory in matched sets of 3, ensuring optimal preload and performance when mounted in tandem or back-to-back arrangements.
71903 ACDGA/HCP4A Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where speed, precision, and rigidity are paramount. Key applications include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Arms
- Aerospace Actuators and Control Systems
- Medical and Dental Drill Handpieces
- Silicon Wafer Processing Equipment
