Nas523 Rivet Code Pdf
When you look at an NAS523 part number (e.g., NAS523-5-8), the code breaks down as follows:
The NAS523 standard helps you break down the confusing string of letters and numbers found on a blueprint. Here is the logic you would find in the document:
Example Part Number: MS20470AD4-5
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
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
The NAS523 Rivet Code is a standardized aerospace identification system used on engineering drawings to specify the exact type, size, and installation requirements of fasteners through a single four-quadrant "cross" symbol. This system allows technicians and engineers to communicate complex assembly instructions—such as head style, material, diameter, and hole preparation—without cluttering blueprints with text. Structure of the NAS523 Symbol
The code is organized into four quadrants around a central crosshair, which represents the location of the rivet. Each quadrant contains specific data: Designation Information Provided Northwest (NW) Upper Left Rivet identity (head style and material) via a letter code. BJ (MS20470AD rivet) Northeast (NE) Upper Right
Rivet diameter in 1/32" increments and manufacturer head location. 4N (1/8" diameter, head on Near side) Southwest (SW) Lower Left nas523 rivet code pdf
Special installation or hole preparation methods (e.g., dimpling). D2 (Dimple both sheets) Southeast (SE) Lower Right Rivet length in 1/16" increments. -6 (3/8" long) Key Identification Codes
In the NW quadrant, letter codes represent specific military standard (MS) or National Aerospace Standard (NAS) fasteners: BJ: MS20470AD (Universal head, 2117 aluminum alloy).
BB: MS20426AD (100° Countersunk head, 2117 aluminum alloy).
AD: Denotes 2117-T alloy, characterized by a single dimple on the rivet head.
DD: "Icebox" rivets (2024-T alloy) requiring heat treatment and refrigeration before installation; identified by two raised dashes. Installation & Hole Preparation (SW Quadrant)
The SW quadrant dictates how the material should be prepared for flush or high-strength installation: D: Dimpled hole. C: Countersunk hole. DC: Dimpled top sheet and countersunk bottom sheet. D2C: Dimple the two top sheets and countersink the third. Technical Resources & Manuals
For those requiring a full reference, the following documents are standard in the industry: NAS523 Rivet Identification Guide | PDF - Scribd
Title: Understanding NAS523 Rivet Code PDF: A Comprehensive Guide
Introduction
Rivets are a crucial component in aircraft construction, and the NAS523 rivet code PDF is a widely used standard for rivet specifications. In this post, we'll dive into the world of rivets, explore the NAS523 rivet code PDF, and provide a comprehensive guide for those looking to understand this critical document.
What is NAS523 Rivet Code PDF?
The NAS523 rivet code PDF is a document published by the National Aerospace Standards (NAS) committee, which provides standardized specifications for rivets used in aircraft construction. The document outlines the requirements for rivet materials, dimensions, and performance, ensuring that rivets meet the stringent demands of the aerospace industry.
Importance of NAS523 Rivet Code PDF
The NAS523 rivet code PDF is essential for several reasons:
Key Components of NAS523 Rivet Code PDF
The NAS523 rivet code PDF covers several key components, including:
Benefits of Using NAS523 Rivet Code PDF
Using the NAS523 rivet code PDF offers several benefits, including:
Conclusion
The NAS523 rivet code PDF is a critical document for the aerospace industry, providing standardized specifications for rivets used in aircraft construction. By understanding the importance and key components of this document, manufacturers and suppliers can ensure that their rivets meet the required standards, improving quality, efficiency, and safety. Whether you're a seasoned aerospace professional or just starting out, this guide provides a comprehensive overview of the NAS523 rivet code PDF. When you look at an NAS523 part number (e
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
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
The system breaks down technical details into four quadrants (NW, NE, SW, and SE), though these compass designations are typically implied rather than labeled on the drawing: Northwest (NW - Upper Left):
Contains the rivet part number (AN or MS) and material code. For example, the code
identifies a standard MS20470AD universal-head rivet made from 2117 aluminum alloy. Northeast (NE - Upper Right): Specifies the rivet diameter
(in 1/32" increments) and the required location of the manufactured head. The letters
(Far) indicate which side of the sheet the head should be on. Southwest (SW - Lower Left): hole preparation instructions. Dimple both sheets. Dimple the top two sheets and countersink the third. Countersink. Southeast (SE - Lower Right): Indicates the fastener
in 1/16" increments. A rivet with a 3/8" length would be marked as Key Reference Documents
If you are looking for specific PDF guides or full listings of these codes, the following resources are highly regarded in the industry: NAS523 Rivet Identification Guide: Available on
, this 4-page guide is a standard vocational training tool that explains the symbolic cross and quadrant system in detail. NASA Fastener Design Manual While broader, this NASA Technical Report
offers foundational knowledge on selecting appropriate fasteners, including solid shank rivets. AIA/NAS Official Standard: For the most authoritative specifications, the AIA/NAS-NAS523
document is the formal standard practice for fastener codes. GlobalSpec If you'd like, I can help you decode a specific part number or provide formulas for calculating proper rivet length for your project. NAS523 Rivet Identification Guide | PDF - Scribd
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 AD: The Material Code
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
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 four-quadrant symbol system used on aerospace drawings to denote rivet part number, material, diameter, hole preparation, and length. Each quadrant offers specific details, such as material codes (NW), diameter and head position (NE), hole preparation (SW), and fastener length (SE). For a complete NAS523 rivet identification guide, visit Scribd.
NAS523 Rivet Identification Guide | PDF | Rivet | Sheet Metal
Understanding the NAS523 Rivet Identification Code The NAS523 Rivet Code is a standardized symbolic system used in the aerospace industry to provide detailed installation instructions for rivets on technical drawings and blueprints. Instead of writing out complex part numbers and installation steps, engineers use a single crosshair symbol to communicate four critical pieces of data simultaneously. The NAS523 Crosshair Symbol
The symbol consists of a central cross whose intersection marks the exact location of the rivet on the drawing. Information is coded into four quadrants around this intersection: Information Provided NW Upper Left Rivet Identity (Part Number & Alloy) BJ (MS20470AD), BB (MS20426AD) NE Upper Right Diameter and Manufacturing Head Location 3N (3/32" diameter, head on Near side) SW Lower Left Hole Preparation (Dimple/Countersink) D (Dimple), C (Countersink), D2C SE Lower Right Rivet Length -5 (5/16"), -6 (3/8") Deep Dive into the Quadrants 1. Northwest (NW): Rivet Identity
This quadrant uses a two-letter code to represent the industry specification (like Military Standards (MS) or National Aerospace Standards (NAS)) and the material alloy. Common Codes: BJ: MS20470AD (Universal head, 2117 aluminum). BB: MS20426AD (100° Countersunk head, 2117 aluminum). 2. Northeast (NE): Diameter & Head Side
The diameter is expressed in increments of 1/32nd of an inch. A letter follows the number to indicate where the manufacturer's head should be placed:
N (Near Side): The head is on the side of the metal closest to the person reading the drawing. F (Far Side): The head is on the opposite side. 3. Southwest (SW): Hole Preparation
Crucial for flush-head installations, this section specifies how the metal sheets should be prepped. D: Dimpled. C: Countersunk. D2C: Dimple the top two sheets and countersink the third. 4. Southeast (SE): Rivet Length Length is indicated in increments of 1/16th of an inch. A -6 code represents a rivet length of 6/16", or 3/8".
For countersunk rivets, the length includes the head; for universal head rivets, it includes only the shank. Why This Matters for Technicians
Using the NAS523 system ensures that structural integrity is maintained across different aircraft components. Technicians can quickly reference guides like the NAS523 Identification Guide PDF or Solid Rivet Specifications to ensure they are using the correct alloy—such as "icebox" rivets (D and DD) which require heat treatment and freezing before installation.
For further technical details or to see specific material charts, you can consult the full NAS523 Standard Practice document or educational resources from platforms like Scribd and StudyLib.
NAS523 Rivet Identification Guide | PDF | Rivet | Sheet Metal - Scribd
As of 2025, many original equipment manufacturers (OEMs) like Boeing (BMS specifications) and Airbus (ABN specifications) have moved toward in-house standards. However, NAS523 remains active for:
If an engineering order calls out NAS523, you must use a genuine 5056 rivet or an approved equivalent (e.g., NAS523A – a newer revision with tighter tolerances).
The specification provides standard hole sizes for each rivet diameter. For example: