Provides instructions for hole preparation, such as D for dimpling, C for countersinking, or D2C (dimple two sheets and countersink the third).
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2117 aluminum alloy (AD rivet, most common for structural repairs). Raised Dot: 2017 aluminum alloy (D rivet). nas523 pdf top
2. Northeast Quadrant (NE): Fastener Diameter and Head Placement
Allows complex data to fit into small spaces on crowded technical drawings. Provides instructions for hole preparation, such as D
Includes all permanent fasteners where installation results in permanent deformation, such as solid rivets.
In the world of aerospace engineering and technical drafting, clear communication is everything. A single misinterpretation on a blueprint can lead to structural failures, costly rework, or safety hazards. That‘s where NAS523 comes in—a specification that ensures everyone from design engineers to shop-floor mechanics speaks the same language when it comes to fasteners. 2117 aluminum alloy (AD rivet, most common for
Indicates the rivet diameter in 1/32-inch increments.