The code consists of a central cross dividing four quadrants, each representing a specific attribute of the rivet installation: Designation Information Provided Fastener Type
, a symbolic "crosshair" system used on blueprints and engineering drawings to specify exactly which fastener goes where. nas523 rivet code pdf
The is a standardized symbolic system used in the aerospace industry to provide detailed instructions for rivet installation on engineering drawings. Instead of listing each detail separately, a "crosshair" symbol is used, with each of its four quadrants representing specific metrics for the fastener. The NAS523 "Cross" Symbol System The code consists of a central cross dividing
For flush riveting, the PDF includes the exact radius and depth of the 100° countersink. A mismatch between the rivet head and the countersink angle creates a stress riser. The NAS523 PDF includes go/no-go gauge dimensions. The NAS523 "Cross" Symbol System For flush riveting,