Often identifies an MS20426AD rivet (countersunk 2117 alloy). ↗️ Northeast (NE): Diameter & Head Placement
An NAS523 part number usually looks like this: NAS523-3 .
| Feature | Specification Detail | | :--- | :--- | | | Usually A286 CRES or Alloy Steel (cadmium plated). | | Thread Class | Typically UNJF (Unified Fine), Class 3B. | | Temperature Range | Dependent on the locking insert material; metal-to-metal locking versions can often withstand temperatures exceeding 450°F (232°C). | | Tensile Strength | High strength; specific values depend on the dash number (size) of the nut. | | Drive Style | Hexagonal drive (standard box wrench or socket fit). |
The is a critical shorthand system used in the aerospace industry to communicate complex fastener specifications on engineering drawings . Rather than cluttering a technical diagram with text, engineers use a single "crosshair" symbol to consolidate multiple data points about a rivet's installation . The NAS523 Crosshair Symbol
The standard, titled "Fastener Code," is an aerospace standard that defines a symbolic coding system for identifying rivets and other permanent fasteners on technical drawings. This system allows engineers to provide detailed installation requirements—such as fastener type, size, material, and head orientation—within a single four-quadrant crosshair symbol. Key Resources and PDF Documents
NAS523 Rivet Identification Code is a standardized symbolic system used in aviation diagrams to define rivet specifications at a glance. It consists of a "crosshair" or "plus" symbol where each quadrant contains specific data about the fastener to be installed. NAS523 Code Structure
Pdf !full! | Nas523
Often identifies an MS20426AD rivet (countersunk 2117 alloy). ↗️ Northeast (NE): Diameter & Head Placement
An NAS523 part number usually looks like this: NAS523-3 . nas523 pdf
| Feature | Specification Detail | | :--- | :--- | | | Usually A286 CRES or Alloy Steel (cadmium plated). | | Thread Class | Typically UNJF (Unified Fine), Class 3B. | | Temperature Range | Dependent on the locking insert material; metal-to-metal locking versions can often withstand temperatures exceeding 450°F (232°C). | | Tensile Strength | High strength; specific values depend on the dash number (size) of the nut. | | Drive Style | Hexagonal drive (standard box wrench or socket fit). | Often identifies an MS20426AD rivet (countersunk 2117 alloy)
The is a critical shorthand system used in the aerospace industry to communicate complex fastener specifications on engineering drawings . Rather than cluttering a technical diagram with text, engineers use a single "crosshair" symbol to consolidate multiple data points about a rivet's installation . The NAS523 Crosshair Symbol | | Thread Class | Typically UNJF (Unified Fine), Class 3B
The standard, titled "Fastener Code," is an aerospace standard that defines a symbolic coding system for identifying rivets and other permanent fasteners on technical drawings. This system allows engineers to provide detailed installation requirements—such as fastener type, size, material, and head orientation—within a single four-quadrant crosshair symbol. Key Resources and PDF Documents
NAS523 Rivet Identification Code is a standardized symbolic system used in aviation diagrams to define rivet specifications at a glance. It consists of a "crosshair" or "plus" symbol where each quadrant contains specific data about the fastener to be installed. NAS523 Code Structure