S7008 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S7008 ACB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.2 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
68 mm
Outside diameter tolerance
-0.007mm to 0
Width
15 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
26
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1550 lbf
Radial static load rating
1192 lbf
Limiting speed
32 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:
$ 257.58
/ each
In Stock
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S7008 ACB/HCP4A Bearing Product Overview & Core Advantages
The S7008 ACB/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional speed, rigidity, and accuracy. As a single-row bearing, it is designed to accommodate high combined loads—primarily radial and axial loads in one direction. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, while the ceramic balls and phenolic cage contribute to lower friction, higher limiting speeds, and extended service life. This bearing is preloaded and pre-lubricated, making it ideal for high-reliability, high-speed spindles and precision machinery.
S7008 ACB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S7008 ACB/HCP4A is decoded as follows:
- S7008: Basic series designation, indicating a 40mm bore and 68mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- B: Signifies a 40° contact angle (Note: Specification sheet indicates 25°, please verify design intent for this specific suffix).
- HCP4A:
- HC: Hybrid Ceramic construction, featuring steel rings and ceramic balls.
- P4: P4 tolerance class (ABEC-7), denoting very high precision.
- A: Indicates a specific internal design and preload level for optimal rigidity.
S7008 ACB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design, combined with a P4 tolerance and factory-applied preload, provides exceptional system stiffness and minimal runout, which is critical for precision machining and positioning.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage significantly lowers friction and allows for a very high limiting speed of 32,000 rpm.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle significant combined radial and axial loads simultaneously, making it robust for demanding operational conditions.
- Long-Term Reliability: The bearing is sealed and pre-lubricated, protecting against contamination and ensuring consistent performance throughout its service life within the specified temperature range of -30°C to 110°C.
S7008 ACB/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- High-Frequency Motors and Spindles: Motors for CNC machinery and PCB drilling.
- Aerospace and Defense Systems: Gyroscopes, navigation instruments, and avionics.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
