71903 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71903 ACD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.03 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
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1462 lbf
Radial static load rating
900 lbf
Limiting speed
103 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 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71903 ACD/HCP4ADGA is a super-precision angular contact ball bearing designed for the most demanding high-performance applications. Engineered to accommodate combined loads and provide exceptional rotational accuracy, this bearing features a universal matchable (SU) design, allowing two bearings to be paired for optimal performance. Its core advantages include an extra light preload (Class A) for minimal friction and high-speed capability, a P4A tolerance class for superior running accuracy, and the use of ceramic balls that reduce centrifugal forces and enable higher limiting speeds. This combination makes it ideal for spindles requiring high rigidity, low heat generation, and extended service life.
71903 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation (17mm bore, 30mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | High P4A tolerance class for super-precision applications |
| HC | Hybrid Ceramic construction (ceramic balls with steel rings) |
| P4A | Geometric and running accuracy per ABEC 7 / P4 standards |
| DGA | Universal Matchable (SU) arrangement, pre-lubricated |
71903 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a limiting speed of 103,000 rpm. This design provides excellent electrical insulation and corrosion resistance.
- High Rigidity & Load Capacity: The 25° contact angle and optimized internal geometry provide superior stiffness, effectively handling combined radial and axial loads with a dynamic load rating of 1462 lbf.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for ultra-precise applications.
- Optimized Cage Design: The phenolic resin cage offers excellent strength-to-weight ratio, reduced friction, and compatibility with high-speed operation and lubrication systems.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, two units can be paired in a back-to-back (DB) or face-to-face (DF) arrangement without selective mounting, simplifying installation and ensuring optimal preload.
71903 ACD/HCP4ADGA Bearing Typical Application Areas
- High-Speed Machine Tool Spindles: CNC milling, grinding, and precision machining centers
- Medical & Dental Equipment: High-speed handpieces, surgical drills, and laboratory centrifuges
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and radar systems
- Semiconductor Manufacturing: Wafer handling robots, precision stages, and inspection equipment
- Industrial Pumps & Compressors: High-speed turbomachinery and precision fluid handling systems
