7018 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7018 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7018 CDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional rotational accuracy. Manufactured to P4A tolerance class, this bearing is designed to accommodate primarily axial loads in one direction and combined loads, making it ideal for high-speed spindles and precision machinery. Its ceramic ball construction and phenolic cage contribute to superior high-speed performance, reduced weight, and enhanced stiffness. The bearing is pre-lubricated and features an open design, optimized for controlled lubrication systems in demanding operational environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series and size designation (90mm bore, 140mm OD, 24mm width) |
| C | 15° contact angle, optimized for high-speed applications and axial load capacity |
| DG | Universal Matchable (SU) designation, indicating the bearing is ground for universal matching in sets |
| A | Extra light preload (Class A), providing minimal internal clearance for high rigidity and precise running accuracy |
| HCP4A | Hybrid Ceramic with Phenolic cage and P4A tolerance class, denoting ultra-precision dimensions and running accuracy |
7018 CDGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, particularly in high-speed applications up to 15,000 rpm.
Phenolic Cage: The lightweight and robust phenolic cage ensures excellent dimensional stability and low friction at high speeds, contributing to the bearing's superior limiting speed capability.
Ultra-Precision P4A Tolerance: Manufactured to ABEC 7 / P4A standards, this bearing guarantees extremely tight dimensional and running tolerances, resulting in minimal vibration and exceptional positional accuracy for precision machinery.
High Rigidity & Load Capacity: The 15° contact angle and extra light preload provide high system stiffness and reliable performance under combined loads, with a dynamic load rating of 17,842 lbf.
Universal Matching Capability: Designed as a Universal Matchable (SU) bearing, it can be mounted in sets (typically 3 bearings) in various configurations (DB, DF, DT) to achieve specific stiffness and load requirements.
7018 CDGA/HCP4A Bearing Typical Application Areas
The 7018 CDGA/HCP4A is ideally suited for high-performance applications requiring extreme precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Grinding Spindles: Internal and external grinding machines
- High-Frequency Motors: Spindles for PCB drilling and routing
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment
- Medical Equipment: High-speed dental handpieces and surgical tools
