S71905 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71905 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.038 kg
Tolerance class
P4A
Seal type
Sealed
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
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1433 lbf
Radial static load rating
855 lbf
Limiting speed
83 X 1000 rpm
Lubrication
Grease
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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S71905 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The S71905 ACDGA/HCP4A is a high-precision, single-row angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. Engineered to accommodate combined loads, it efficiently supports both radial loads and substantial axial loads in one direction. Its compact design, featuring a 9 mm width, makes it ideal for space-constrained, high-speed applications. Manufactured to the stringent P4A tolerance class and preloaded for extra-light conditions, this bearing delivers superior running accuracy and operational reliability, making it a cornerstone for advanced mechanical systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71905 | Basic bearing designation, indicating a metric series, 25 mm bore, 42 mm OD, 9 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Universal Matchable (SU) bearing, designed to be mounted in pairs or sets (3 bearings in a set) to achieve specific preload or rigidity. |
| HC | Hybrid Ceramic construction, featuring ceramic balls and a steel ring for reduced weight, higher speed capability, and longer service life. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring minimal runout and vibration for ultra-precise applications. |
S71905 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a higher limiting speed of 83,000 rpm. This construction also offers superior resistance to electrical erosion and operates effectively with minimal lubrication.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at high speeds, offering excellent dimensional stability and low friction.
- Extra Light Preload (Class A): The bearing is supplied with a pre-set preload, eliminating internal clearance. This enhances system rigidity, improves rotational accuracy, and dampens vibration, which is critical for high-precision spindles.
- Sealed & Grease Lubricated: The integrated seals retain the factory-applied grease lubrication and protect against contamination, providing a maintenance-free solution within the specified temperature range of -30°C to 110°C.
S71905 ACDGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications where speed, accuracy, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Instrumentation: Measuring devices, optical scanners, and laboratory equipment.
- High-Speed Motors and Drives: Servo motors, spindle drives, and robotics.
- Aerospace and Defense Systems: Gyroscopes, navigation systems, and auxiliary power units.
