71905 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 CD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.078 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2498 lbf
Radial static load rating
1800 lbf
Limiting speed
100.5 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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71905 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71905 CD/HCP4ADGA is a super-precision angular contact ball bearing engineered for the most demanding high-speed and high-accuracy applications. Its universal matchable (SU) design allows for flexible mounting in pairs to support combined loads (radial and axial) in any configuration. Featuring a P4A tolerance class and a ceramic ball construction, this bearing delivers exceptional rotational accuracy, thermal stability, and extended service life, making it ideal for high-performance spindles.
71905 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD). |
| CD | 15° contact angle and specific internal design. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced friction, lower heat generation, and higher speed capability. |
| P4A | Super Precision Tolerance Class: Exceeds ABEC 7 standards, ensuring ultra-high running accuracy and dimensional stability. |
| DGA | Universal Matchable (SU): Bearings are supplied as a matched set of 2 that can be mounted in any combination (back-to-back, face-to-face, or tandem) to handle bidirectional thrust loads. |
71905 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a limiting speed of 100,500 rpm. This construction also offers superior resistance to electrical arcing and operates effectively with minimal lubrication.
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance at high speeds, contributing to smooth operation and reduced vibration.
- Extra Light Preload (Class A): This preload class minimizes starting and running torque while ensuring high system rigidity and precise rotational accuracy, which is critical for machining finish and positioning repeatability.
- High Load Capacity: With a dynamic load rating of 2498 lbf and a static load rating of 1800 lbf, this bearing is capable of handling significant combined radial and axial loads.
71905 CD/HCP4ADGA Bearing Typical Application Areas
This super-precision angular contact ball bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed CNC machining centers, grinding spindles, and milling spindles.
- Precision Instrumentation: High-speed measuring and inspection equipment.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
