S7008 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7008 CDGA/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
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3780 lbf
Radial static load rating
2475 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
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 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S7008 CDGA/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a universally matchable single bearing with an extra light preload (Class A), it delivers exceptional rotational accuracy and stability. Its defining characteristics include the ability to support combined loads (radial and axial) simultaneously, facilitated by a 15° contact angle. The use of ceramic balls and a phenolic cage significantly enhances its high-speed performance, reduces friction, and increases operational life, making it an ideal choice for ultra-precise spindles and machinery.
S7008 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Basic bearing series, indicating a 40mm bore, 68mm OD, and 15mm width. |
| C | 15° nominal contact angle. |
| DGA | Universal Matchable bearing. Two bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to support higher moment loads. |
| HC | Hybrid Ceramic construction, featuring steel rings and silicon nitride (Si3N4) ceramic balls. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring extremely tight dimensional and running accuracy. |
S7008 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The extra light preload (Class A) eliminates internal clearance, providing superior system rigidity, reduced vibration, and precise shaft positioning, which is critical for high-precision machining.
- Enhanced High-Speed Performance: The combination of ceramic balls (lighter and harder than steel) and a lightweight phenolic resin cage reduces centrifugal forces and friction, allowing for a very high limiting speed of 41,000 rpm. This design also minimizes heat generation.
- Superior Load Capacity: The 15° contact angle and precision-ground raceways are optimized to handle significant combined radial and axial loads.
- Long Service Life and Reliability: The hybrid ceramic design offers excellent wear resistance and is less susceptible to lubrication failure. The sealed design with pre-applied grease protects against contamination and ensures long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S7008 CDGA/HCP4A Bearing Typical Application Areas
This bearing is engineered for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and drilling centers.
- Precision Robotic Drives and Servo Motors: Ensuring accurate and repeatable motion control.
- High-Speed Dental and Medical Handpieces: Where compact size and extreme rotational speeds are required.
- Aerospace and Semiconductor Manufacturing Equipment: Including PCB drilling machines and wafer handling robots.
