7008 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 ACDGA/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
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2340 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7008 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7008 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 25° contact angle and a P4A super-precision tolerance class, making it ideal for high-speed spindles and precision machinery. Its ceramic balls and phenolic cage contribute to reduced friction, lower operating temperatures, and enhanced high-speed capability, delivering superior reliability and long service life in critical operations.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series, indicating a 40mm bore, 68mm OD, and 15mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | High internal design and geometry optimization. |
| GA | Specific internal clearance and preload grouping for universal matching (SU). |
| /HC | Hybrid Ceramic: Features ceramic balls for high-speed and reduced weight. |
| P4A | Super-precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy. |
7008 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls significantly reduces centrifugal forces, lowers friction, and enables higher limiting speeds (56,000 rpm). This construction also provides electrical insulation and superior performance in high-temperature environments.
- Phenolic Resin Cage: This lightweight, high-strength cage material offers excellent dimensional stability and low friction, contributing to smooth operation at high speeds and reduced vibration.
- Precision Ground Geometry: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, ensuring minimal runout and superior system rigidity.
- Universal Matchable Design (SU): Bearings are supplied in sets of three, pre-ground to allow for flexible mounting arrangements (back-to-back, face-to-face, or tandem) to optimize stiffness and load distribution for specific application requirements.
- Optimized for Combined Loads: The 25° contact angle is engineered to provide an excellent balance between radial and axial load carrying capacity.
7008 ACDGA/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and imaging scanner rotors.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors and Spindles: Where minimal vibration and maximum rotational accuracy are critical.
