7218 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7218 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
1.83 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.01mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
27225 lbf
Radial static load rating
23850 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 748.55
/ each
In Stock
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7218 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7218 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 25° contact angle and is supplied with a preload, enabling it to handle significant combined loads (radial and axial) simultaneously while providing high running accuracy and system stiffness. Manufactured to P4 (ABEC-7) tolerance class and utilizing ceramic balls, it is optimized for high-speed operation and extended service life in precision machinery.
7218 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation indicating a metric series with a 90 mm bore and 160 mm outside diameter. |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is supplied with a preload for enhanced rigidity and precise shaft positioning. |
| HC | Indicates the use of Hybrid Ceramic components, specifically ceramic balls. |
| P4 | Denotes a high-precision tolerance class (ABEC-7 equivalent), ensuring minimal runout and vibration. |
7218 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The preloaded single-row design and P4 tolerance provide exceptional system stiffness and running accuracy, critical for minimizing deflection under load.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls reduces centrifugal forces, enabling a high limiting speed of 15,000 rpm. This also lowers operating temperatures and reduces friction.
- Enhanced Durability and Life: Ceramic ball material offers superior wear resistance, lower thermal expansion, and electrical insulation properties, significantly increasing bearing life, especially in contaminated or electrically sensitive environments.
- Optimized Load Capacity: The 25° contact angle is engineered to support substantial axial loads in one direction while also accommodating radial loads, making it ideal for combined load applications.
7218 ACD/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: For PCB drilling, dental handpieces, and small tool spindles.
