7218 CD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7218 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7218 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This metric bearing features a back-to-back (DB) matched arrangement and a P4A tolerance class, making it ideal for high-precision machinery. Its core advantage lies in its ability to handle combined loads—significant radial and bidirectional axial loads simultaneously—delivering superior performance in demanding operational environments. The pre-set moderate preload (Class C) ensures optimal stiffness and rotational accuracy right from installation.
7218 CD/P4ADBC 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 bearings supplied as a matched set). |
| DB | Back-to-back mounting arrangement. |
| P4A | High-precision tolerance class with strict dimensional and running accuracy limits. |
| Open | No integral seal or shield, suitable for controlled environments or custom lubrication systems. |
7218 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, stable support system that significantly increases bearing rigidity. This design is exceptionally effective at resisting moment loads and managing combined radial and axial loads from both directions.
Precision & Speed Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The phenolic cage and open design contribute to lower friction and a high limiting speed of 17,000 rpm, making it suitable for high-speed applications.
Durability & Material Quality: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue resistance and long service life. The 16 high-precision balls work in unison to distribute loads evenly, enhancing overall durability.
7218 CD/P4ADBC Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Gearboxes: In industrial drives and transmissions where accurate shaft positioning is critical.
- High-Frequency Motors & Spindles: Applications demanding smooth operation at very high rotational speeds.
- Industrial Pumps & Compressors: For handling significant axial and radial loads in fluid and air movement systems.
- Robotic Arms & Precision Automation: Where repeatable accuracy and high stiffness are paramount.
