71903 ACE/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71903 ACE/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.028 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
14 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1170 lbf
Radial static load rating
652 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
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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71903 ACE/HCP4ADGA Bearing Product Overview & Core Advantages
The 71903 ACE/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and speed. Engineered with a 25° contact angle and an Extra Light (Class A) preload, this bearing delivers superior rotational accuracy and rigidity. Its ceramic balls and phenolic cage contribute to outstanding high-speed performance, with a limiting speed of 121,000 rpm. As a Universal Matchable (SU) bearing, it can be paired with another identical bearing to form a pre-loaded duplex set, optimizing it for handling combined loads (radial and axial) simultaneously. This makes it an ideal, compact solution for high-reliability spindle and precision machinery.
71903 ACE/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation (17mm bore, 30mm OD). |
| ACE | Specific internal design and contact angle (25°). |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | High-Precision Tolerance Class, equivalent to ABEC 7, ensuring extremely tight dimensional and running accuracy. |
| DGA | Universal Matchable (SU) designation. Two bearings can be universally matched in a duplex set (DB, DF, or DT arrangement) without selective mounting. |
71903 ACE/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially in high-speed applications.
- Optimized Preload (Class A): The extra light preload minimizes friction and heat generation while ensuring high system rigidity and precise shaft positioning, critical for applications demanding minimal runout.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction at high rotational speeds, contributing to the bearing's impressive 121,000 rpm limiting speed.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant combined radial and axial loads simultaneously, providing stable and reliable performance under complex loading conditions.
- Universal Matchability (SU): This feature allows for simplified assembly of pre-loaded bearing pairs, ensuring consistent, high-performance characteristics in duplex configurations without the need for selective sorting.
71903 ACE/HCP4ADGA Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where speed, accuracy, and rigidity are paramount. Key applications include:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Main Shafts
- High-Speed Robotic Drives and Actuators
- Dental and Medical Handpiece Drives
- Aerospace Instrumentation and Gyroscopes
- Semiconductor Manufacturing Equipment
