Nas523 Rivet Code Pdf !new! (WORKING • 2027)

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. nas523 rivet code pdf

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

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): The NAS523 Rivet Code is a standardized identification

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 4 = 4/32 inch diameter

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

4. Diameter

The number following the material code represents the diameter of the rivet shank in thirty-seconds of an inch.

• 4 = 4/32 inch diameter.
• 6 = 6/32 inch diameter.
• 8 = 8/32 inch diameter.

Digital Tools and Search Strategies

To find the latest nas523 rivet code pdf using modern search techniques:

• Use filetype:pdf operator – Example: "NAS523" filetype:pdf site:sae.org
• Search by standard status – Append “active,” “revised,” or “cancelled” to filter results.
• Leverage fastener distributor resources – Companies like Cherry Aerospace, LISI Aerospace, or Howmet (formerly Alcoa Fasteners) often publish summarized data sheets with rivet code breakdowns that complement the full PDF.

Example: NAS523-6-8

• Diameter = 6/32" = 3/16" (0.1875")
• Length = 8/16" = 1/2" (0.500")

Revision History: Why It Matters

The NAS523 standard has undergone several revisions (e.g., Rev 5 vs. Rev 8). Changes have included:

• Rev 3 (1972) – Added A286 material.
• Rev 6 (1989) – Updated shear test fixture geometry.
• Rev 9 (2015) – Metric equivalents added for international procurement.

If your rivet code pdf is Rev 5, but the aircraft maintenance manual (AMM) references Rev 9, your installation may be non-compliant with 14 CFR Part 43 (maintenance rules).

Overview

NAS523 is a specification from the National Aerospace Standards (NAS) series that covers rivet types, sizes, material, and installation/inspection acceptance criteria used in aerospace applications. It defines standard head styles, shank dimensions, material properties, mechanical and physical requirements, and marking/packaging conventions for solid and semi-tubular rivets commonly used in aircraft assembly.

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