7218 CD/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7218 CD/P4A
Basic Information
System of measurement
Metric
Weight
2.27 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
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
28575 lbf
Radial static load rating
25200 lbf
Limiting speed
14 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 324.96
/ each
In Stock
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7218 CD/P4A Bearing Product Overview & Core Advantages
The 7218 CD/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing with a 15° contact angle, it is optimized to handle combined loads, carrying significant radial loads and axial loads in one direction simultaneously. Its P4 (ABEC-7) tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other high-performance machinery. The phenolic cage and preload availability contribute to its stability and smooth operation at high rotational speeds.
7218 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation: 90 mm bore, 160 mm OD, 30 mm width. |
| CD | Indicates a specific contact angle (15°) and internal design optimized for high rigidity and precise operation. |
| P4A | Specifies the tolerance class P4 (ABEC-7) with specific running accuracy requirements for the inner and outer rings. |
7218 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The optimized internal geometry, including the 15° contact angle and availability of preload, provides high system rigidity, minimizing deflection under load for superior machining accuracy.
- Superior Load Capacity: Engineered to support high dynamic and static radial loads (28,575 lbf / 25,200 lbf) while effectively managing thrust loads, making it suitable for demanding combined load applications.
- High-Speed Performance: The lightweight phenolic resin cage ensures low inertia and excellent guidance of the precision-ground chrome steel balls, enabling stable operation up to the limiting speed of 14,000 rpm.
- Optimized for Precision Applications: The open seal type allows for customized lubrication solutions, while the tight dimensional tolerances guarantee consistent performance in high-precision spindles.
7218 CD/P4A Bearing Typical Application Areas
This bearing is a critical component in equipment where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and Precision Gearboxes
- Aerospace Actuation Systems
- Medical Equipment such as high-speed dental handpieces
- Precision Measuring Instruments
