7218 ACDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7218 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7218 ACDGA/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and an extra light preload (Class A), making it ideal for spindle arrangements where minimal deflection under load is critical. Its P4A tolerance class ensures superior dimensional and running accuracy, while the universal matching (SU) designation allows for flexible mounting in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations to handle combined loads effectively. The open design, combined with a phenolic cage, facilitates high-speed operation.
7218 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing designation: 90 mm bore, 160 mm OD, 30 mm width. |
| AC | Angular Contact design. |
| DGA | Contact angle of 25°. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
7218 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class with extremely tight bore, outer diameter, and width tolerances, this bearing provides exceptional running accuracy and system stability, minimizing vibration and thermal growth.
- Optimized for Combined Loads: The 25° contact angle is engineered to efficiently support substantial radial loads and axial loads in one direction simultaneously.
- Superior High-Speed Capability: The lightweight and robust phenolic resin cage ensures excellent dimensional stability and low friction at high rotational speeds, contributing to a limiting speed of 17,000 rpm.
- Universal Matching (SU): As a universal matchable bearing, the 7218 ACDGA/P4A can be paired with other SU bearings in any combination (DB, DF, DT) without pre-selection, simplifying installation and achieving the required preload and stiffness.
- High Load Capacity: With a dynamic load rating of 27,225 lbf and a static load rating of 23,850 lbf, it offers reliable performance in strenuous applications.
7218 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: For CNC machining centers, grinders, and lathes.
- High-Speed Motors and Spindles: Used in PCB drilling, dental handpieces, and small tool spindles.
- Precision Robotic Drives: In robotic arms and joints requiring high positional accuracy.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and other critical rotational mechanisms.
