7008 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7008 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7008 CD/HCP4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. This universal matchable (SU) bearing features a 15° contact angle and extra light preload (Class A), making it ideal for spindle arrangements requiring minimal deflection and high rigidity. Its construction with ceramic balls and a phenolic cage enables superior high-speed capability and reduced rotational mass. The bearing comes pre-lubricated and is manufactured to P4A tolerance class, ensuring consistent performance in precision machinery.
7008 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series with 40mm bore, 68mm OD, 30mm width |
| CD | 15° contact angle and optimized internal design for high-speed operation |
| HC | Hybrid ceramic construction with steel rings and ceramic balls |
| P4A | High precision tolerance class with enhanced running accuracy |
| DGA | Universal matchable designation for paired mounting in any combination |
7008 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride ceramic balls provides superior performance at high speeds (up to 41,000 rpm), reduced friction, and extended service life. The ceramic balls also offer electrical insulation and superior performance in high-temperature environments.
Phenolic Cage Construction: The phenolic resin cage ensures excellent dimensional stability and reduced weight, contributing to lower centrifugal forces and enhanced high-speed capability.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and minimal vibration for precision applications.
Universal Matchability: As an SU-type universal matchable bearing, pairs can be mounted in any combination (face-to-face, back-to-back, or tandem) without performance degradation, providing design flexibility for spindle arrangements.
7008 CD/HCP4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, CNC milling machines, and grinding spindles
- Precision Medical Equipment: Dental handpieces, surgical tools, and laboratory instrumentation
- Aerospace Systems: Gyroscopes, navigation systems, and auxiliary power units
- High-Speed Motors: Electric vehicle motors, industrial servo motors, and robotics
- Semiconductor Manufacturing: Wafer handling equipment, precision positioning stages
