7008 CE/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 CE/HCP4AQBCA
Basic Information
System of measurement
Metric
Weight
0.68 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
60 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7312 lbf
Radial static load rating
6862 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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7008 CE/HCP4AQBCA Bearing Product Overview & Core Advantages
The 7008 CE/HCP4AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. Engineered with a back-to-back (QBC) matched arrangement of four bearings, it delivers superior stability under combined loads (radial and axial). Its construction with ceramic balls and a P4A super-precision tolerance class makes it ideal for high-speed, high-rigidity applications where minimal runout and thermal stability are critical.
7008 CE/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CE | Hybrid bearing featuring Ceramic balls and steel rings. |
| HC | Indicates a high-capacity internal geometry design. |
| P4A | Denotes a super-precision tolerance class with enhanced running accuracy. |
| QBC | Specifies a Quadruplex (4 bearings) Back-to-Back matched set arrangement. |
| A | Identifies an Extra light preload for minimal friction and high-speed operation. |
7008 CE/HCP4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Stability: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational accuracy.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a high limiting speed of 56,000 rpm. The 15° contact angle is optimized for high-speed axial load capacity.
- High Precision & Low Heat Generation: Manufactured to P4A tolerance standards for exceptional dimensional and running accuracy. The extra light preload (A) minimizes friction and heat buildup, extending service life.
- Extended Service Life: The hybrid ceramic-steel construction provides enhanced durability, reduced wear, and improved performance in lubricant-starved conditions compared to all-steel bearings.
7008 CE/HCP4AQBCA Bearing Typical Application Areas
This precision bearing is ideally suited for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and navigation instruments.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
