Nas523 Rivet Code Pdf
The NAS523 Rivet Code is a standardized identification system established by the National Aerospace Standards Committee used to specify rivet types and installation requirements on aviation blueprints and assembly drawings. Unlike the standard MS (Military Standard) or AN (Army-Navy) part numbering, the NAS523 code uses a multi-quadrant "crosshair" symbol to consolidate various technical specifications into a single visual locating point. The NAS523 Crosshair Symbol
The core of the system is a four-cornered cross with a locating point at the center. Each quadrant represents a specific set of data:
NW (Northwest): Typically contains the rivet part number or manufacturer code.
NE (Northeast): Often indicates the rivet diameter, usually measured in 32nds of an inch.
SW (Southwest): Specifies additional installation details or material types.
SE (Southeast): Generally used for the rivet length, measured in 16ths of an inch.
If a drawing is too crowded, a larger cross may be placed to the side with a leader line pointing to a smaller cross at the exact installation site. Rivet Identification and Material Codes
Technicians use these codes alongside physical markings on the rivet heads to ensure structural integrity. Standard material codes found within these systems include:
A: Pure aluminum (1100), often used for non-structural applications.
AD: 2117 aluminum alloy, identified by a single dimple on the head; these are "field rivets" that do not require heat treatment.
DD: 2024 aluminum alloy, identified by two raised dashes; known as "icebox rivets," they must be heat-treated and refrigerated before use. D: 2017 aluminum alloy, marked with a raised dot. Installation Specifications nas523 rivet code pdf
The NAS523 system often implies standard installation rules for safety and durability:
Edge Distance: The distance from the center of the rivet hole to the nearest edge should be at least 2 times the rivet diameter ( ) to prevent edge splitting. Rivet Pitch (Spacing): Minimum: 3 times the diameter ( Maximum: 12 times the diameter ( 12D12 cap D
Shop Head (Bucked Head) Dimensions: A properly formed shop head should be 1.5 times the diameter of the rivet shank in width and 0.5 times the diameter in thickness. Reference Resources
For full technical tables and visual charts, detailed PDF guides are available through professional repositories: NAS523 Rivet Identification Guide | PDF - Scribd
NAS523 Rivet Code is a standardized symbolic system used in aviation engineering drawings to provide precise instructions for fastener installation. It uses a single "crosshair" symbol divided into four quadrants, each representing specific rivet data. Quadrant Breakdown
Information is placed in the following "compass" positions relative to the center cross: NW (Northwest - Upper Left): Contains a two-letter code representing the head style and alloy " identifies a standard MS20470AD rivet (2117 alloy). NE (Northeast - Upper Right): Indicates the rivet diameter " increments) and the location of the manufacturer's head " stands for Near Side; " " stands for Far Side. SW (Southwest - Lower Left): hole preparation or special methods. ": Dimpled. ": Countersunk. ": Dimple the top two sheets and countersink the third. SE (Southeast - Lower Right): Specifies the fastener length " increments. " rivet is shown as " Resources & PDF Guides
Detailed NAS523 documentation and identification charts can be found on several technical hosting platforms: NAS523 Rivet Identification Guide (Scribd)
: A comprehensive breakdown of head markings, alloy letters, and the NAS523 symbol system. Installation of Basic Aircraft Fasteners (Blue Tuna Docs)
: Provides technical diagrams showing the "cross" symbol and its variations. NAS523 - Fastener Code (GlobalSpec)
: Official standard practice documentation for permanent deformation fasteners. specific alloy code list (e.g., what "BJ" or "CX" stands for) or a guide on how to calculate proper rivet length for your specific sheet metal thickness? NAS523 Rivet Identification Guide | PDF - Scribd The NAS523 Rivet Code is a standardized identification
The NAS523 rivet code, also known as the Boeing Fastener Code, is a standardized symbol system used in aviation blueprints to communicate precise fastener requirements within a single "plus" or "crosshair" symbol. The NAS523 Plus Symbol Layout
The code consists of a central cross dividing four quadrants, each representing a specific attribute of the rivet installation: Designation Information Provided Northwest (NW) Fastener Type
Standard or part number (e.g., "BJ" for a specific rivet type). Northeast (NE) Diameter & Head
Diameter in 1/32" increments and the location of the manufactured head (Near or Far). Southwest (SW) Alloy/Material
Indicates the rivet material alloy (e.g., "AD" for 2117 aluminum). Southeast (SE) Fastener Length
Length in 1/16" increments (e.g., a "-6" indicates 6/16" or 3/8"). Standard Rivet Identification & Selection
Beyond the NAS523 symbol, standard aircraft rivets (like those starting with AN or MS prefixes) follow specific sizing and installation rules: NAS523 Rivet Identification Guide | PDF - Scribd
code is a symbolic system used on aviation blueprints and technical drawings to specify rivet installation details within a single four-quadrant "crosshair" symbol. NAS523 Quadrant Breakdown
The information is organized into four quadrants representing different technical specifications: NW (Northwest / Upper Left): Specifies the rivet part number (typically MS or AN) and the material alloy code The letters identify an MS20470AD rivet made of 2117 aluminum alloy. NE (Northeast / Upper Right): Indicates the rivet diameter
" increments and the required positioning of the manufactured head. : Manufactured head on the : Manufactured head on the SW (Southwest / Lower Left): Details the hole preparation method required, such as dimpling or countersinking. : Countersink. : Dimple top two sheets, countersink the third. SE (Southeast / Lower Right): Specifies the rivet length " increments. negative 6 code indicates a " rivet length. Reference Documents Decoding the NAS523 Rivet Code Unlike steel or
Comprehensive details and code charts are typically found in manufacturer-specific manuals or standard practice documents: NAS523 Rivet Identification Guide (PDF) AIA/NAS Standard Practice NAS523 Aircraft Solid Shank Rivet ID Guide (like BJ, BH, or BB) or a full conversion chart for a particular aircraft model? NAS523 Rivet Identification Guide | PDF - Scribd
NAS523 Rivet Code is a symbolic identification system used in aviation diagrams and engineering drawings to communicate fastener specifications clearly through a four-quadrant "crosshair" symbol. NAS523 Quadrant Breakdown
The code provides details for each quadrant without explicitly labeling the compass designations (NW, NE, SW, SE). Northwest (Upper Left) : Specifies the Part Number (e.g., AN or MS) and Material/Alloy The letters represent an MS20470AD rivet made from 2117 aluminum alloy. Northeast (Upper Right) : Specifies the Rivet Diameter and the required location of the manufactured head. : Manufactured head is on the : Manufactured head is on the Southwest (Lower Left) : Provides Dimple and Countersink instructions. means dimple the top two sheets and countersink the third. Southeast (Lower Right) : Indicates the Rivet Length , often shown in increments like -6. Reference Documents
For full technical specifications and a complete listing of letter codes, you can consult these resources: NAS523 Rivet Identification Guide : A detailed 4-page guide is available via Scribd (NAS523 Guide) Fastener Design Manual : While more general, the NASA Technical Reports Server provides extensive data on rivet selection and strength. Aircraft Standard Handbook : Chapter 10 of this Aircraft Standard Handbook covers marking holes according to NAS523 codes. material code (like BJ, BB, or AD) to identify a particular rivet? NAS523 Rivet Identification Guide | PDF - Scribd
It sounds like you’re looking for an explanation or breakdown of the NAS523 rivet code (likely from a PDF source), rather than the PDF file itself.
Here’s a concise, informative piece covering the NAS523 rivet designation system — as found in aerospace engineering standards.
Decoding the NAS523 Rivet Code
Unlike steel or copper rivets, aluminum rivets are generally identified by a combination of a raised dimple on the manufactured head and a specific anodized color. The NAS523 rivet code uses a purple or violet anodized finish.
However, the full code printed on engineering drawings and in the NAS523 rivet code PDF follows a logical structure:
NAS523 - XX - YY
Understanding the NAS523 Rivet Code System
In aerospace structural assembly, NAS523 refers to a specific type of solid rivet with a protruding head (universal head) and a standard shank. The "code" associated with NAS523 rivets is actually a part numbering system that encodes diameter, length, and material.