Specifies a combination layout for joining thick and thin sheets together. 4. Bottom Quadrant: Grip Length
Often, you will see a small circle or a specific letter assignment attached to the symbol lines. If a circle is placed on one of the legs of the cross, it indicates the or far side placement of the manufactured head of the rivet. This ensures that flush rivets are installed properly on the aerodynamic exterior of the aircraft. Practical Example of an NAS523 Code
: 5056 Aluminum Alloy (Raised cross/standard for magnesium) M : Monel (No mark or plain)
: The top two sheets are dimpled, while the third underlying sheet is countersunk. nas523 rivet code pdf
: Monel (Nickel-copper alloy, highly corrosion-resistant and heat-resistant)
The NAS523 rivet code is more than just a numbering system—it is the language of aerospace structural integrity. Whether you are a mechanic looking to replace a fastener or an engineer designing a spar, understanding how to decipher the codes (and having the NAS523 PDF handy for verification) is a non-negotiable skill.
NAS stands for , originally developed by the Aerospace Industries Association (AIA) to standardize components that were previously built to proprietary or military specifications. NAS523 specifically defines the dimensional and identification standards for solid rivets made of 5056 aluminum alloy. Specifies a combination layout for joining thick and
Aerospace manufacturers, Quality Assurance (QA) inspectors, and Airframe and Powerplant (A&P) mechanics frequently utilize a . Relying on memory introduces human error. A comprehensive reference PDF provides several benefits:
Her computer was old, the internal network slower than molasses. She typed the search into the mothballed technical library’s search bar: .
Detailed NAS523 documentation and identification charts can be found on several technical hosting platforms: NAS523 Rivet Identification Guide (Scribd) If a circle is placed on one of
Indicates the length of the rivet or special installation notes (e.g., dimple, spot weld). Why You Need a NAS523 Rivet Code PDF
While basic charts cover common aluminum rivets, the official (published by the Aerospace Industries Association - AIA) is crucial for aerospace engineers, quality assurance inspectors, and procurement specialists. The official PDF includes:
NAS523 Rivet Code is a standardized symbolic system used in aviation blueprints to communicate precise fastener and installation requirements within a single 4-cornered "crosshair" symbol. Understanding the NAS523 Quadrants
