7048 ACD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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7048 ACD/P4A Bearing Product Overview & Core Advantages
The 7048 ACD/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and superior rigidity. Engineered to a P4 (ABEC-7) tolerance class, it excels in handling significant combined loads—simultaneously supporting high radial loads and thrust loads in one direction. Its optimized internal geometry, featuring a 25° contact angle, ensures stable operation and is ideally suited for high-speed spindles and other precision machinery requiring exceptional running accuracy and reliability.
7048 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7048 | Basic bearing series, defining the standard boundary dimensions (Bore: 240mm, OD: 360mm, Width: 56mm). |
| AC | Angular Contact design with a 25° contact angle for optimal thrust load capacity. |
| D | Indicates a high-capacity internal design, typically involving larger or more balls. |
| P4A | Specifies the tolerance class P4 (ABEC-7) and likely includes specific running accuracy requirements. The "A" suffix often denotes a specific internal fit or preload. |
7048 ACD/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The bearing's robust construction, utilizing a phenolic resin cage and a complement of 22 large-diameter balls (38.1mm), provides high rigidity. This enables it to handle substantial dynamic and static radial loads (73,125 lbf and 104,625 lbf respectively) and high one-direction thrust loads.
High-Speed Performance: The lightweight and durable phenolic cage is essential for high-speed operation, reducing centrifugal forces and allowing for a limiting speed of 5,000 rpm. The 25° contact angle is a balanced design for both speed and thrust capacity.
Precision and Reliability: Manufactured to P4 precision class with tight dimensional tolerances, this bearing ensures minimal runout and vibration, which is critical for the accuracy of machine tool spindles and other high-precision applications.
7048 ACD/P4A Bearing Typical Application Areas
The 7048 ACD/P4A is engineered for demanding industrial environments, including:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high precision, speed, and rigidity.
- High-Frequency Motors and Spindles: Where superior running accuracy and high-speed capability are paramount.
- Precision Gearboxes and Pumps: Applications needing reliable performance under significant combined loads.
