S7215 ACD/P4ADBC
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S7215 ACD/P4ADBC Bearing Product Overview & Core Advantages
The S7215 ACD/P4ADBC is a precision duplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set bearing features a moderate preload (Class C) and is manufactured to P4A tolerance class for superior running accuracy. Its primary advantage lies in its ability to handle combined loads—significant radial and bidirectional axial loads—simultaneously, making it ideal for high-precision, high-rigidity spindles and machinery where positional stability is critical. The sealed design with phenolic cage contributes to reliable, high-speed operation.
S7215 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- S7215: Basic model number denoting a 75mm bore and 130mm outside diameter.
- ACD: Angular Contact design with a Duplex (DB) back-to-back arrangement.
- P4A: Precision 4 tolerance class with specific running accuracy requirements for the inner and outer rings.
- DBC: Duplex Back-to-Cack mounting with a moderate preload (Class C) applied.
S7215 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid, moment-resistant bearing system, capable of supporting high combined radial and axial loads. The 25° contact angle is optimized for axial load carrying capacity.
High-Speed Performance: The lightweight and robust phenolic resin cage ensures stability and reduced centrifugal forces, enabling a high limiting speed of 28,000 rpm. The bearings are pre-lubricated with grease suitable for the specified operating range.
Precision & Longevity: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing ensures precise shaft positioning and smooth, vibration-free operation. The sealed design protects against contamination, extending service life in challenging environments.
S7215 ACD/P4ADBC Bearing Typical Application Areas
The S7215 ACD/P4ADBC is ideally suited for high-performance applications requiring superior precision and stiffness, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-frequency Spindle Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
