7008 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7008 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
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
7.938 mm
Ball quantity
18
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2340 lbf
Limiting speed
34 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:
$ 214.4
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7008 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7008 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its 25° contact angle and P4 (ABEC-7) tolerance class, making it ideal for high-speed spindles and precision machinery. Its core advantages include the ability to accommodate combined radial and axial loads simultaneously, superior high-speed performance enabled by a phenolic cage and ceramic balls, and the availability of preload for enhanced system stiffness.
7008 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Indicates a 25° contact angle. This optimized angle provides an excellent balance between radial load capacity and axial load capacity. |
| HC | Signifies the use of Hybrid Ceramic components, specifically ceramic balls. This reduces weight, lowers friction, and allows for higher limiting speeds. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with specific running accuracy requirements. This ensures ultra-precise rotation, minimal runout, and superior performance in high-precision applications. |
7008 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class, this bearing guarantees minimal dimensional variation and exceptional running accuracy, which is critical for applications like machine tool spindles.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and ceramic balls (Hybrid Ceramic) significantly reduces centrifugal forces and friction, enabling a high limiting speed of 34,000 rpm.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently handle significant combined radial and axial loads, providing reliable performance under complex loading conditions.
- Extended Service Life: Ceramic balls offer superior wear resistance, lower thermal expansion, and are electrically insulating, contributing to longer bearing life and consistent performance in challenging environments.
- Preload Availability: The option for preload allows for the elimination of internal clearance, resulting in increased system stiffness and further enhanced rotational accuracy.
7008 ACD/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- High-Speed Machine Tool Spindles
- Precision Grinding Machines
- High-Frequency Motors and Spindles
- Aerospace and Defense Instrumentation
- Medical and Dental Equipment
- Semiconductor Manufacturing Equipment
