The NAS523 code is a standardized symbolic system used on aerospace engineering drawings to identify rivets and other permanent fasteners. It provides aircraft maintenance engineers (AMEs) and technicians with specific instructions regarding the fastener's part number, diameter, length, and installation method through a single "crosshair" symbol. Understanding the NAS523 "Cross" Symbol
Review of NAS 523 PDF:
The NAS523 Rivet Code System is a standardized, four-quadrant "cross" symbol used in aerospace engineering to convey detailed rivet installation data—part number, diameter, material, and length—directly on technical drawings. This method replaces extensive text, with the symbol's center pinpointing the fastener location while adhering to specific spacing and edge distance requirements. For a detailed breakdown of the NAS523 coding system, visit Studylib. Boeing Fasteners | PDF | Rivet | Screw - Scribd nas523 pdf top
Rivet diameter and the side of the sheet for the manufactured head ( Lower Left Specialized installation requirements like countersinking Lower Right Fastener length in increments (e.g., -6 for 3/8"). 🏗️ Technical Implementation Details The NAS523 code is a standardized symbolic system