7218 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7218 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
1.83 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.004mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
28575 lbf
Radial static load rating
25200 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
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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In Stock
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7218 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7218 CDGA/HCP4A is a single row angular contact ball bearing engineered for applications demanding the highest levels of precision and performance. Operating under the P4A super-precision tolerance class, this bearing is designed to provide exceptional running accuracy, low noise, and low vibration. Its 15° contact angle is optimized for handling combined loads, effectively supporting significant radial loads alongside axial loads in one direction. A key performance advantage is its capability for high-speed operation, enabled by a lightweight phenolic cage and ceramic balls which reduce centrifugal forces and friction. Supplied as a Universal Matchable (SU) set, it allows for precise preload configuration when mounted with other bearings from the same set, delivering superior rigidity and system stability.
7218 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7218 CDGA/HCP4A provides detailed technical specifications through its suffixes:
- 7218: Basic designation indicating a metric series bearing with a 90 mm bore and 160 mm outside diameter.
- C: Denotes a 15° nominal contact angle.
- D: Indicates the bearing is filled with a Polymer Damper (Hytrel) for vibration suppression.
- GA: Specifies a preload classification of "Extra Light" (Class A).
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4A: Defines the tolerance class, which is superior to ABEC 7/ISO P4, ensuring ultra-precise dimensions and runout.
7218 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction and heat generation. This construction offers electrical insulation, higher limiting speed (17,000 rpm), and extended service life, especially in poor lubrication conditions.
- High Rigidity & Precision: Manufactured to P4A tolerance standards, the bearing ensures minimal runout and maximum system accuracy. The extra light preload (GA) minimizes deflection under load, providing high rigidity for demanding applications.
- Superior Load Capacity: With a dynamic load rating of 28,575 lbf and a static load rating of 25,200 lbf, it is capable of handling substantial combined loads.
- Optimized High-Speed Performance: The lightweight phenolic resin cage offers excellent strength and guidance at high speeds, while the ceramic balls lower centrifugal loading, collectively enabling reliable operation at the specified limiting speed.
- Vibration Damping: The integrated polymer damper (D) absorbs high-frequency vibrations, leading to smoother operation and enhanced performance in sensitive machinery.
7218 CDGA/HCP4A Bearing Typical Application Areas
The 7218 CDGA/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are critical. Key application fields include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotic Drives: In articulated arms and high-accuracy gearboxes.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small tool spindles.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: For CT scanners, centrifuges, and other diagnostic imaging devices.
