7218 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7218 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
4.53 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
60 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
46800 lbf
Radial static load rating
50400 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
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:
$ 603.11
/ each
In Stock
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7218 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7218 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a back-to-back (DB) matched arrangement and a P4A tolerance class, making it ideal for high-speed spindles and precision machinery. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously while providing high running accuracy and stiffness. The light preload (Class B) ensures minimal deflection under operational stresses, contributing to superior performance in demanding environments.
7218 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation: 90 mm bore, 160 mm OD, 60 mm width. |
| C | 15° contact angle, optimized for combined loads. |
| D | Duplex (two single bearings supplied as a set). |
| P4A | High-precision tolerance class for superior running accuracy. |
| DB | Back-to-Back arrangement, providing high moment rigidity. |
| B | Light preload (Class B) for reduced deflection and vibration. |
7218 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and enhancing overall system stiffness. This is critical for maintaining precision under combined loads.
- Superior Load Capacity: With a dynamic radial load rating of 46,800 lbf and a static radial load rating of 50,400 lbf, this bearing is engineered to handle significant radial and axial forces simultaneously, thanks to its optimized 15° contact angle.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, while the precise P4A tolerance and balanced design contribute to a high limiting speed of 17,000 rpm, making it suitable for high-speed applications.
- Precision & Accuracy: Manufactured to P4A precision class standards with tight dimensional tolerances on the bore, outside diameter, and width, ensuring minimal runout and superior rotational accuracy for demanding machinery.
- Material Integrity: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and durability under a wide operating temperature range (-30°C to 110°C).
7218 CD/P4ADBB Bearing Typical Application Areas
This precision duplex angular contact ball bearing is ideally suited for high-performance applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Industrial Pumps.
- High-Frequency Motors and Spindle Drives.
- Robotics and Automation Equipment requiring precise rotary motion.
- Medical Equipment and Test & Measurement Instruments.
