7218 ACD/P4AQBCA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7218 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
73125 lbf
Radial static load rating
95625 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 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 7218 ACD/P4AQBCA is a precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. This arrangement is engineered to provide exceptional stiffness and stability, making it ideally suited for applications demanding high rotational accuracy and the ability to withstand significant combined loads (radial and axial). Its P4A tolerance class ensures superior running accuracy, while the extra light preload (Class A) minimizes deflection under operational stresses, contributing to enhanced machine performance and longevity.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation: 90 mm bore, 160 mm OD, 120 mm width. |
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class for superior running accuracy. |
| QBC | Quadruplex Back-to-Back matched arrangement of 4 bearings. |
| A | Specifies Extra Light Preload on the matched set. |
7218 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The Quadruplex Back-to-Back (QBC) configuration creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in demanding applications.
- Superior Load Capacity: With a 25° contact angle and a robust design utilizing chrome steel rings and balls, this bearing is optimized to handle substantial combined radial and axial loads.
- Optimized for High-Speed Operation: The phenolic cage is lightweight and possesses excellent sliding properties, contributing to lower friction and enabling a high limiting speed of 17,000 rpm. The bearing is pre-lubricated for immediate operation.
- Precision Performance: Manufactured to P4A tolerance standards with tight dimensional controls on the bore, outside diameter, and width, ensuring predictable and accurate performance in the most precise assemblies.
7218 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is designed for high-performance machinery where precision, rigidity, and speed are paramount. Key applications include:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-speed Precision Spindles
- Industrial Pumps and Compressors
- Advanced Robotic Drives and Automation Systems
