7218 ACD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7218 ACD/P4ADBC
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
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
47700 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7218 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADBC is a precision angular contact ball bearing configured as a duplex back-to-back (DB) matched set. Engineered to the exacting P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. This bearing is specifically designed to handle combined loads—simultaneously supporting substantial radial loads and bidirectional axial loads—thanks to its 25° contact angle. The moderate preload (Class C) ensures high system rigidity, minimizes deflection under load, and is ideal for applications demanding superior running accuracy and positioning performance.
7218 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation indicating a 90 mm bore, 160 mm OD, and 60 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates the bearing is part of a Duplex (paired) set. |
| P4A | Denotes a high-precision tolerance class with enhanced dimensional and running accuracy requirements. |
| DB | Specifies the Back-to-Back mounting arrangement of the matched pair. |
| C | Indicates a Moderate Preload is applied to the matched set. |
7218 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists overturning moments and can handle significant combined radial and axial loads from both directions. The moderate preload further enhances this rigidity, ensuring minimal shaft displacement under operational stresses.
- Precision Performance: Manufactured to P4A tolerance class with a phenolic cage, this bearing guarantees exceptional running accuracy, low vibration, and stable operation, which is critical for high-speed and high-precision machinery.
- Optimized for Demanding Conditions: The open seal type allows for optimal lubrication flow, contributing to a high limiting speed of 17,000 rpm. The use of chrome steel for rings and balls ensures high durability and a long service life under heavy loads.
7218 ACD/P4ADBC Bearing Typical Application Areas
This precision duplex bearing set is ideally suited for high-performance applications requiring high rigidity and accuracy, such as:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Speed Precision Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
