7218 CD/P4AQBCA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7218 CD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
9.06 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
120 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
76050 lbf
Radial static load rating
101250 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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7218 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 7218 CD/P4AQBCA is a precision quadruplex angular contact ball bearing designed for applications requiring exceptional rigidity and load capacity. This metric system bearing features an Extra light preload (Class A) and is supplied as a matched set of four bearings in a Back-to-Back (QBC) arrangement. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high precision, making it ideal for high-stiffness, high-speed machinery where positional accuracy is critical.
7218 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation: 90mm bore, 160mm OD, 120mm width. |
| CD | Contact angle of 15° and optimized internal design. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| QBC | Quadruplex Back-to-Back matched arrangement. Four bearings are precision-matched as a set for optimal load distribution and stiffness. |
7218 CD/P4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and moments. With a dynamic load rating of 76,050 lbf and a static load rating of 101,250 lbf, it offers reliable performance in demanding conditions.
- High-Speed Capability: The phenolic cage and 15° contact angle contribute to stable operation at high rotational speeds, with a limiting speed of 17,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), this bearing ensures high running accuracy and minimal vibration.
- Optimized Internal Geometry: Constructed from chrome steel for rings and balls, with 16 balls of 22.225mm diameter, providing high durability and long service life.
7218 CD/P4AQBCA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-Speed Precision Spindles
- Industrial Pumps and Compressors
- Robotic and Automation Equipment
- Other machinery requiring high rigidity, precision, and high-speed capability.
