71905 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.039 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.006mm 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° to 110 °C
Radial dynamic load rating
1433 lbf
Radial static load rating
855 lbf
Limiting speed
63 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 177.14
/ each
In Stock
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71905 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71905 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This single-row bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, while also supporting significant radial loads. Its defining features include a 25° contact angle for optimal thrust capacity, a P4 (ABEC-7) tolerance class for superior running accuracy, and a phenolic resin cage enabling high-speed operation. Preloaded and lubricated from the factory, it offers high rigidity and is ready for immediate installation in demanding, high-reliability systems.
71905 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 9mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high-precision bearing with enhanced dimensional and running accuracy. |
| HC | Indicates the use of Hybrid Ceramic components (Ceramic balls with steel rings). |
| P4 | Corresponds to ABEC-7 tolerance class, denoting very high precision. |
| A | Specifies that the bearing is supplied with a preload for increased rigidity. |
71905 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This construction allows for higher limiting speeds (63,000 rpm), extended service life, and improved performance in applications with electrical currents or marginal lubrication.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to the bearing's exceptional high-speed capability and smooth operation with minimal centrifugal forces.
- Precision & Rigidity: Manufactured to P4 tolerance class and supplied with a preload, this bearing ensures minimal runout and high system stiffness, which is critical for maintaining precision under load.
- Optimized Load Capacity: The 25° contact angle is engineered to handle high thrust loads efficiently while maintaining a robust radial load rating (1433 lbf dynamic).
- Factory Lubrication: Pre-lubricated for immediate use, ensuring optimal performance from startup.
71905 ACD/HCP4A Bearing Typical Application Areas
This high-performance precision bearing is ideally suited for advanced applications where speed, accuracy, and reliability are paramount. Key industries and equipment include:
- High-Speed Machine Tool Spindles: For CNC machining centers, grinders, and milling machines.
- Precision Robotics: In robot arm joints and high-accuracy actuators.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
