Nas523 Pdf -

: Provides specific installation instructions, such as dimpling or countersinking requirements.

The is a standardized identification system used in the aviation industry to concisely provide detailed specifications for rivets on engineering drawings and technical diagrams. Instead of writing out full part numbers, a single four-quadrant "crosshair" symbol is used to indicate the rivet's type, diameter, manufacturer’s head location, and length. 1. Understanding the NAS523 Symbol Structure nas523 pdf

, often an AN (Air Force-Navy) or MS (Military Standard) number. Upper Right (Northeast): Specifies the rivet diameter : Provides specific installation instructions