7218 CD/P4ADGB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7218 CD/P4ADGB Bearing Product Overview & Core Advantages
The 7218 CD/P4ADGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it delivers superior performance in handling combined radial and axial loads. Manufactured to the stringent P4A tolerance class, this bearing ensures minimal runout and stable operation, making it ideal for high-speed spindles and other precision machinery where reliability is critical.
7218 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
- 7218: Basic designation indicating a 90 mm bore, 160 mm OD angular contact bearing.
- C: Denotes a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is part of a universal matchable (SU) duplex set, allowing any two bearings to be paired without selective matching.
- P4A: Specifies the ultra-precision tolerance class, exceeding ABEC 7 standards for superior running accuracy.
- DGB: Signifies a light preload (Class B) applied to the duplex set, reducing axial play and enhancing system rigidity.
7218 CD/P4ADGB Bearing Structural Features & Performance Benefits
The 7218 CD/P4ADGB's design incorporates several key features that deliver distinct performance advantages:
- High Rigidity & Load Capacity: The duplex arrangement and 15° contact angle provide exceptional stiffness, enabling the bearing to withstand significant combined loads while maintaining precision.
- Superior High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at the limiting speed of 17,000 rpm, reducing centrifugal forces and heat generation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore, OD, and width, ensuring consistent performance and easy integration into precision assemblies.
- Optimized Preload: The factory-applied light preload (DGB) eliminates internal clearance, resulting in higher system natural frequency and improved positional accuracy.
7218 CD/P4ADGB Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for applications requiring high rotational accuracy and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial transmission systems requiring minimal backlash
- High-Frequency Motors: Spindle motors and servo drives
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, laboratory centrifuges, and imaging systems
