71905 CE/HCP4ALDGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 CE/HCP4ALDGA
Basic Information
System of measurement
Metric
Weight
0.072 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
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1960 lbf
Radial static load rating
1260 lbf
Limiting speed
83 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 CE/HCP4ALDGA Bearing Product Overview & Core Advantages
The 71905 CE/HCP4ALDGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universal matchable bearing is designed to accommodate combined loads (radial and axial) simultaneously. Its ceramic ball construction and P4A super-precision tolerance class deliver superior high-speed capability, reduced friction, and extended service life, making it an ideal solution for high-reliability, high-rotational accuracy scenarios.
71905 CE/HCP4ALDGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| CE | 15° Contact Angle | Optimized for high-speed operation and moderate axial loads. |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Reduced friction, lower operating temperature, and extended lubricant life. |
| P4A | Super Precision Tolerance Class | Guarantees extremely tight running accuracy for superior system performance. |
| AL | Extra Light Preload | Minimizes bearing deflection under light loads, ideal for high-speed spindles. |
| DGA | Universal Matchable (SU Arrangement) | Bearings can be mounted in a universal arrangement to support axial loads in both directions. |
71905 CE/HCP4ALDGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of silicon nitride balls with a chrome steel ring significantly reduces centrifugal forces, enabling higher limiting speeds (83,000 rpm). This combination also provides electrical insulation, non-magnetic properties, and superior wear resistance.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures stable operation at ultra-high speeds, contributing to the bearing's overall high-speed performance and low vibration levels.
- Precision Engineering: Manufactured to P4A tolerance class with extremely tight dimensional control on bore, outside diameter, and width, this bearing ensures precise shaft positioning and minimal runout.
- Universal Matching Capability (SU): As a universal matchable bearing, two bearings can be paired in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement without selective mounting, simplifying installation and providing high rigidity.
71905 CE/HCP4ALDGA Bearing Typical Application Areas
This precision bearing is ideally suited for applications where high rotational accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
