Nas523 Rivet Code Pdf May 2026
NAS523 Rivet Code
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
Southwest (SW) Quadrant - Special Operations
: Indicates if the material needs specific preparation, such as dimpling or countersinking . D = Dimple C = Countersink D2 = Dimple both sheets nas523 rivet code pdf
Introduction
Detailed specifications and charts for these codes can be found in several technical guides: NAS523 Rivet Code The is a standardized symbolic
The NAS523 standard has undergone several revisions (e.g., Rev 5 vs. Rev 8). Changes have included: D = Dimple C = Countersink D2 =
NAS523 Rivet Code
The is a standardized symbol used in aviation diagrams and engineering drawings to specify precise details for fastener installation. Instead of long text strings, it uses a single four-quadrant "crosshair" symbol to communicate the rivet part number, material, size, and necessary hole preparation. Quadrant Breakdown
DD
: "Icebox" rivets (2024-T alloy) requiring heat treatment and refrigeration before installation; identified by two raised dashes. Installation & Hole Preparation (SW Quadrant)
