S71905 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71905 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.038 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
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
40 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:
$ 212.06
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S71905 ACD/HCP4A Bearing Product Overview & Core Advantages
The S71905 ACD/HCP4A is a high-precision, single-row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. Positioned within the P4 (ABEC-7) tolerance class, it guarantees minimal running noise and vibration. A key feature is its ceramic ball material, which significantly reduces friction, heat generation, and wear, enabling superior high-speed performance up to 40,000 rpm. The combination of a phenolic cage and preloaded design delivers high rigidity and stable rotational characteristics, making it an ideal solution for spindles and other high-reliability machinery.
S71905 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| S7 | Series designation for high-precision angular contact bearings. | Indicates a design optimized for precision and high-speed operation. |
| 1905 | Standard size designation (25mm bore, 42mm OD, 9mm width). | Defines the compact bearing dimensions for integration into space-constrained designs. |
| A | 30° contact angle (standard for this series). | Provides excellent capability to handle combined loads (radial and axial). |
| CD | Duplex arrangement with a preload. | Ensures high rigidity and precise shaft positioning by eliminating axial play. |
| HC | Hybrid Ceramic (Silicon Nitride balls). | Enables higher speeds, reduced friction, and longer service life. |
| P4 | Tolerance class equivalent to ABEC-7. | Guarantees ultra-precision bearing performance with tight dimensional and running accuracy. |
S71905 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls with a chrome steel ring results in a lighter, harder, and more electrically resistant bearing. This directly contributes to lower centrifugal forces, reduced operating temperature, and enhanced high-speed performance.
- High Rigidity & Preload: The duplex "CD" arrangement applies a consistent preload, which dramatically increases system stiffness. This is critical for applications requiring minimal deflection under load and superior positional accuracy.
- Optimized for High Speeds: The lightweight phenolic resin cage is ideal for high rotational speeds, offering excellent strength and guidance with minimal friction. Combined with the hybrid design, it allows the bearing to reach its maximum limiting speed of 40,000 rpm.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant combined loads, providing robust support for both radial and axial forces encountered in demanding operations.
- Sealed & Lubricated for Life: As a sealed bearing that is pre-lubricated, it is protected from contamination and is designed for long-term, maintenance-free operation within its specified temperature range.
S71905 ACD/HCP4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance machinery where speed, accuracy, 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 laboratory equipment.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Robotics: High-accuracy joints and actuators.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and control systems.
