S7008 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S7008 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 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
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
3780 lbf
Radial static load rating
2475 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:
$ 257.7
/ each
In Stock
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S7008 CD/HCP4A Bearing Product Overview & Core Advantages
The S7008 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features a 15° contact angle and is supplied with a preload, delivering superior running accuracy and high rigidity. Its design is optimized to handle combined loads (simultaneous radial and axial loads) efficiently. Manufactured to a P4 (ABEC-7) tolerance class and equipped with ceramic balls, it is ideally suited for high-speed operation and applications where minimal heat generation and long service life are critical.
S7008 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| S7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 15mm width). | Defines the core bearing dimensions. |
| CD | Indicates a specific internal design with a 15° contact angle and preload. | Ensures high rigidity and precise shaft positioning. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride). | Enables higher limiting speeds, reduced friction, and longer life, especially in lubricant-starved conditions. |
| P4 | Denotes the tolerance class (ABEC-7). | Guarantees extremely tight dimensional and running accuracy for high-precision applications. |
| A | Indicates the bearing is lubricated (greased). | Provides ready-to-install, maintenance-free operation. |
S7008 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces and friction, allowing for a higher limiting speed (24,000 rpm) and improved operational efficiency.
- Preloaded Design: The built-in preload eliminates internal clearance, resulting in superior shaft rigidity and precise rotational accuracy, which is critical for applications like machine tool spindles.
- Phenolic Resin Cage: The phenolic cage is lightweight and possesses excellent slip characteristics, contributing to smooth operation at high speeds and reduced cage wear.
- High Load Capacity: With a dynamic load rating of 3780 lbf and a static load rating of 2475 lbf, this bearing reliably handles significant combined loads.
- Sealed & Lubricated: The sealed design with factory-applied lubricant protects against contamination and ensures long-term, maintenance-free performance within the specified temperature range (-30° to 110°C).
S7008 CD/HCP4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally deployed in high-performance machinery, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- High-Speed Motors and Spindles: Where maximum rotational speed and accuracy are required.
- Precision Robotics: In critical joints and arm assemblies demanding high rigidity and responsiveness.
- Aerospace & Defense Systems: In gyroscopes, actuators, and other precision mechanisms.
- Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
