: This specifies the rivet's diameter in increments of 1/32 of an inch. It also uses letters like (Near side) or
5056 rivets are softer than 2017 or 2024. The PDF chart provides minimum double-shear strength (in lbs). NAS523-6 might shear at 380 lbs, while a same-size 2017 would be 520 lbs. Do not substitute without engineering approval.
Many websites offering “free NAS523 rivet code pdf” are scams or provide incomplete, outdated versions. Using an obsolete revision can lead to failed FAA conformity audits (e.g., FAA Order 8110.42).
| Code Segment | Meaning | Example | | :--- | :--- | :--- | | | Basic specification number | NAS523 | | XX | Nominal Diameter (in 32nds of an inch) | -10 = 10/32" = 5/16" dia. | | YY | Length (in 16ths of an inch) | -12 = 12/16" = 3/4" length |
: Structural thresholds for each code configuration under specific environmental loads. nas523 rivet code pdf
The Ultimate Guide to the NAS523 Rivet Code: Understanding Aerospace Fastener Symbols
The lower-right quadrant manages physical length constraints and engineering process overrides.
When structural repairs require replacing rivets, the NAS523 code on the drawing tells the technician exactly what rivet was originally used, preventing the use of incorrect materials or sizes. Common Rivet Types and Codes in NAS523
The symbol consists of a central locating point (the cross) divided into four quadrants: . : This specifies the rivet's diameter in increments
The initial part of the code designates the specific standard number, which dictates the head style (countersunk or universal) and the specific design standard. Common examples include:
Aircraft structural assembly relies heavily on precision, standardization, and absolute traceability. In aerospace manufacturing and repair, rivets are the literal fasteners holding structures together under immense stress.
The code in the top quadrant identifies the base part standard, which dictates the head style (universal head, 100-degree countersunk, etc.) and the material composition of the rivet. Common base standard prefixes include: : Universal head rivets. MS20426 : 100-degree countersunk head rivets.
: Indicate the aluminum alloy or material type (e.g., AD represents 2117-T4 aluminum alloy, the industry standard for structural riveting). 2. The Left Quadrant: Rivet Diameter NAS523-6 might shear at 380 lbs, while a
This distinction is crucial—when decoding a rivet callout, the diameter value represents 1/32 inch increments.
The is a standardized symbolic system used on aviation engineering drawings to specify exact rivet types, dimensions, and installation requirements. Instead of listing details in text, a "crosshair" symbol is used, with each of the four quadrants (named like a compass) containing specific information: Quadrant Breakdown
The code might also include letters representing installation methods, such as 'D' for dimpled and 'W' for spot-welded. How to Find a NAS523 Rivet Code PDF