7218 ACD/P4ADBA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7218 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADBA is a duplex back-to-back (DB) matched pair of precision angular contact ball bearings designed for applications demanding exceptional rotational accuracy and rigidity. This P4A tolerance class bearing is pre-lubricated and features an Extra Light (Class A) preload, making it ideal for high-speed spindles and other precision machinery where minimal deflection under combined loads is critical. Its matched set configuration ensures optimal performance and simplified installation.
Model Code Breakdown
- 7218: Basic bearing series, indicating a medium cross-section angular contact bearing with a 90mm bore, 160mm OD, and 60mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a Duplex (two-bearing) configuration.
- DB: Specifies the Back-to-Back mounting arrangement of the duplex pair.
- P4A: Denotes a super-precision tolerance class, with enhanced running accuracy for both inner and outer rings.
- Open: The bearing is supplied without seals or shields, allowing for optimal lubrication flow in controlled environments.
7218 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that can withstand significant combined radial and axial loads, as well as moment loads. This is further enhanced by the 25° contact angle and the Extra Light preload, which eliminates internal clearance for precise shaft positioning.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, while the open design and pre-lubrication facilitate efficient heat dissipation, contributing to a high limiting speed of 17,000 rpm.
Precision Operation: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures smooth, quiet, and vibration-free operation essential for high-precision applications.
Durability: Constructed from high-grade chrome steel for both rings and balls, the bearing offers excellent wear resistance and a long operational life under demanding conditions.
7218 ACD/P4ADBA Bearing Typical Application Areas
The 7218 ACD/P4ADBA is engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
