S71908 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71908 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.1 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2632 lbf
Radial static load rating
1800 lbf
Limiting speed
24 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:
$ 376.9
/ each
In Stock
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S71908 ACD/HCP4A Bearing Product Overview & Core Advantages
The S71908 ACD/HCP4A is a high-precision, single-row angular contact ball bearing designed for demanding applications requiring exceptional accuracy and speed performance. Engineered with a 25° contact angle and P4 (ABEC-7) tolerance class, it is optimized to handle combined loads, primarily thrust loads with radial load capacity. Its compact design, featuring a ceramic ball and phenolic cage, delivers superior high-speed capability, reduced friction, and excellent operational stability, making it ideal for high-reliability, precision machinery.
S71908 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71908 | Denotes the bearing series and basic size (40mm bore, 62mm OD, 12mm width). |
| ACD | Indicates a 25° contact angle and that the bearing is supplied with a specific preload for high rigidity and precise running accuracy. |
| HC | Signifies the use of Hybrid Ceramic balls, which provide lower density, reduced centrifugal force, and superior performance at high speeds. |
| P4A | Specifies the tolerance class P4 (ABEC-7), ensuring extremely tight dimensional and running accuracy for precision applications. |
S71908 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The combination of ceramic balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 24,000 rpm.
- High Rigidity & Precision: The 25° contact angle and factory-set preload (ACD) provide excellent axial and radial stiffness, minimizing deflection under load for superior positional accuracy.
- Superior Load Capacity: Engineered to handle significant combined radial and axial loads, with a dynamic load rating of 2632 lbf and static load rating of 1800 lbf.
- Optimized for Precision: Manufactured to P4 tolerance class with precise bearing dimensions (bore, OD, width) and a controlled temperature range of -30°C to 110°C for stable operation.
S71908 ACD/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where speed, precision, and rigidity are critical. Key industries and equipment include:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Robotics and Automation Systems
- High-Frequency Spindles for PCB drilling and routing
- Aerospace & Defense instrumentation and control systems
- Medical Device motors and high-speed scanners
