S7008 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7008 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 kg
Tolerance class
P4A
Seal type
Sealed
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
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
4
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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S7008 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The S7008 ACDGA/HCP4A is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. This sealed bearing features a 25° contact angle and is manufactured to P4A super-precision tolerance, ensuring minimal runout and superior rotational accuracy. Its core advantage lies in its ability to accommodate combined loads (radial and bidirectional axial loads) simultaneously with high rigidity, making it an ideal solution for high-speed spindles and precision machinery. The combination of a phenolic cage and ceramic balls contributes to its outstanding high-speed performance and extended service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 15mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Double row design for high rigidity and load capacity. |
| GA | Universal Matchable (SU designation), indicating the bearing is supplied in a set of 4 for precise preload arrangement. |
| HC | Hybrid Ceramic construction, featuring ceramic balls for reduced friction and higher speed capability. |
| P4A | Super Precision tolerance class, exceeding ABEC 7 standards for extreme running accuracy. |
S7008 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row angular contact design provides superior radial and axial stiffness, enabling stable operation under combined loads. With a dynamic load rating of 3578 lbf, it handles significant operational stresses.
- Exceptional High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls significantly reduce centrifugal forces, allowing for a high limiting speed of 41,000 rpm. This makes it a premier high-speed bearing.
- Precision & Accuracy: Manufactured to P4A tolerance with tight dimensional control on the bore, outside diameter, and width, this bearing ensures minimal vibration and precise shaft positioning.
- Longevity & Reliability: The sealed construction retains grease and excludes contaminants. The standard grease lubrication is suitable for a wide operating temperature range (-30°C to 110°C), offering a maintenance-free service life.
S7008 ACDGA/HCP4A Bearing Typical Application Areas
This precision bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high rigidity and accuracy.
- High-Frequency Motors & Spindles: Where extreme rotational speeds and low vibration are critical.
- Medical & Dental Equipment: High-speed handpieces and diagnostic scanners.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
