7018 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7018 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7018 ACD/HCP4ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universally matchable (SU) bearing is designed to accommodate combined loads (radial and axial) simultaneously, with its 25° contact angle providing optimal thrust capacity. Manufactured to P4A tolerance class, it guarantees ultra-precise running accuracy and dimensional stability. The combination of a phenolic cage and ceramic balls enables superior high-speed performance up to 17,000 rpm, while the extra light preload (Class A) ensures smooth, low-friction operation ideal for high-rigidity spindle configurations.
7018 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series and size designation (90mm bore, 140mm OD) |
| ACD | 25° contact angle design optimized for high-speed operation |
| HC | Hybrid Ceramic construction (steel rings with ceramic balls) |
| P4A | Ultra-precision tolerance class exceeding ABEC 7 standards |
| DGA | Universal matchable (SU) designation for precise bearing sets |
7018 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, enabling higher limiting speeds while providing electrical insulation properties and extended service life.
Phenolic Resin Cage: The lightweight phenolic cage material offers excellent dimensional stability at high temperatures and speeds, contributing to the bearing's exceptional high-speed capability and reduced vibration.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring precise fitment and minimal runout for applications demanding extreme accuracy.
Universal Matching Capability: As a universally matchable (SU) bearing, the 7018 ACD/HCP4ADGA can be paired in any combination without pre-selection, simplifying installation and maintenance while maintaining optimal preload and stiffness.
7018 ACD/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 medical imaging devices
- Aerospace Systems: Gyroscopes, navigation instruments, and auxiliary power units
- Semiconductor Manufacturing: Wafer handling robots, precision positioning stages
- High-Speed Motors: Spindle motors, turbochargers, and specialized drive systems
