S71906 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71906 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.044 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
47 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
20
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
968 lbf
Limiting speed
36 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:
$ 283.97
/ each
In Stock
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S71906 ACD/HCP4A Bearing Product Overview & Core Advantages
The S71906 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and reliability. This single-row bearing is designed to accommodate combined loads, primarily handling high axial loads in one direction, and is supplied with a preload for enhanced system rigidity and precise rotational accuracy. Its compact design, featuring a 25° contact angle and ceramic balls, makes it an ideal solution for high-speed and high-rigidity applications such as machine tool spindles.
S71906 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact bearings. |
| 1906 | Indicates the bearing size: 30mm bore, 47mm OD, 9mm width. |
| ACD | Signifies a 25° contact angle and a specific internal design optimized for high rigidity. |
| HC | Denotes the use of hybrid ceramic balls (Silicon Nitride), which reduce centrifugal forces and enable higher speeds. |
| P4 | Specifies the tolerance class (ABEC-7 / ISO P4), indicating very high running accuracy. |
| A | Indicates that the bearing is supplied with a preload for maximum stiffness. |
S71906 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The combination of a 25° contact angle, preload, and P4 tolerance class ensures minimal deflection under load, providing exceptional system stiffness and rotational accuracy critical for machining and precision instrumentation.
- Superior High-Speed Performance: The hybrid ceramic balls are lighter and harder than steel, significantly reducing centrifugal forces and friction. This, combined with the lightweight phenolic cage, allows for a high limiting speed of 36,000 rpm.
- Enhanced Durability and Temperature Resistance: Ceramic balls have a lower coefficient of thermal expansion than steel, maintaining preload and performance over a wider temperature range (-30° to 110 °C). They are also electrically insulating and highly resistant to wear.
- Optimized Load Capacity: Engineered to handle significant axial loads and combined loads, with a dynamic load rating of 1521 lbf and a static load rating of 968 lbf.
S71906 ACD/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications 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 coordinate measuring machines (CMM).
- High-Frequency Motors and Spindles: Electric spindles for PCB drilling and dental handpieces.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotational components.
