7008 ACEGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 ACEGB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 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
15 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2632 lbf
Radial static load rating
1620 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7008 ACEGB/HCP4A Bearing Product Overview & Core Advantages
The 7008 ACEGB/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. As a single bearing designed for universal matching (SU), it can be paired with an identical bearing to form a precisely preloaded set capable of withstanding combined loads. Its core advantages stem from a P4A super-precision tolerance class, a ceramic ball construction, and a light preload (Class B), making it ideal for high-speed spindles and other high-performance machinery.
7008 ACEGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| EGB | Optimized internal geometry and grinding for high-speed operation and low torque. |
| HC | Hybrid Ceramic construction, featuring ceramic balls and steel rings. |
| P4A | Super Precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy. |
7008 ACEGB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds (limiting speed of 41,000 rpm).
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures stable operation at high rotational speeds and offers excellent resistance to wear.
- Universal Matchable Design (SU): This bearing is supplied with a light preload (Class B) and is universally matchable, allowing two bearings to be paired in any combination (back-to-back, face-to-face, or tandem) to achieve optimal system stiffness and handle complex combined loads.
- Super-Precision Tolerances: The P4A tolerance class and tight dimensional control on the bore diameter and outside diameter ensure minimal runout and superior positional accuracy.
7008 ACEGB/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Robotics: High-accuracy robotic arms and joints.
- High-Frequency Motors and Spindles: Applications requiring extreme rotational velocities.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace Instrumentation: Gyroscopes and other precision navigation systems.
